B, C or D which one is correct ???

A security architect for a large, multinational manufacturer needs to design and implement a security solution to monitor traffic.

When designing the solution, which of the following threats should the security architect focus on to prevent attacks against the network?

 A Packets that are the wrong size or length
 B Use of any non-DNP3 communication on a DNP3 port
 C Multiple solicited responses over time
 D Application of an unsupported encryption algorithm

A network architect is designing a new SD-WAN architecture to connect all local sites to a central hub site. The hub is then responsible for redirecting traffic to public cloud and datacenter applications. The SD-WAN routers are managed through a SaaS, and the same security policy is applied to staff whether working in the office or at a remote location. The main requirements are the following:

1. The network supports core applications that have 99.99% uptime.

2. Configuration updates to the SD-WAN routers can only be initiated from the management service.

3. Documents downloaded from websites must be scanned for malware.

Which of the following solutions should the network architect implement to meet the requirements?

Options:

A Reverse proxy, stateful firewalls, and VPNs at the local sites
B IDSs, WAFs, and forward proxy IDS
C DoS protection at the hub site, mutual certificate authentication, and cloud proxy
D IPSs at the hub, Layer 4 firewalls, and DLP

i think the answer is option C ? but need a validation 

A company is outsourcing to an MSSP that performs managed detection and response services. The MSSP requires a server to be placed inside the network as a log aggregate and allows remote access to MSSP analyst. Critical devices send logs to the log aggregator, where data is stored for 12 months locally before being archived to a multitenant cloud. The data is then sent from the log aggregate to a public IP address in the MSSP datacenter for analysis.

A security engineer is concerned about the security of the solution and notes the following.

* The critical devise send cleartext logs to the aggregator.

* The log aggregator utilize full disk encryption.

* The log aggregator sends to the analysis server via port 80.

* MSSP analysis utilize an SSL VPN with MFA to access the log aggregator remotely.

* The data is compressed and encrypted prior to being achieved in the cloud.

Which of the following should be the engineer's GREATEST concern?

Options:

A Hardware vulnerabilities introduced by the log aggregate server
B Network bridging from a remote access VPN
C Encryption of data in transit
D Multinancy and data remnants in the cloud

Due to locality and budget constraints, an organization's satellite office has a lower bandwidth allocation than other offices in the organization. As a result, the local security infrastructure staff is assessing architectural options that will help preserve network bandwidth and increase speed to both internal and external resources while not sacrificing threat visibility.

Which of the following would be the BEST option to implement?

Options:

A Distributed connection allocation
B Local caching
C Content delivery network
D SD-WAN vertical heterogeneity