An e-commerce company is running a web server on premises, and the resource utilization is usually less than 30%. During the last two holiday seasons, the server experienced performance issues because of too many connections, and several customers were not able to finalize purchase orders. The company is looking to change the server configuration to avoid this kind of performance issue.

Which of the following is the MOST cost-effective solution?

1. Move the server to a cloud provider.
2. Change the operating system.
3. Buy a new server and create an active-active cluster.
4. Upgrade the server with a new one.

@E-Li need your suggestion here 

Clients are reporting slowness when attempting to access a series of load-balanced APIs that do not require authentication. The servers that host the APIs are showing heavy CPU utilization. No alerts are found on the WAFs sitting in front of the APIs.

Which of the following should a security engineer recommend to BEST remedy the performance issues in a timely manner?

Options:

A Implement rate limiting on the API.
B Implement geoblocking on the WAF.
C Implement OAuth 2.0 on the API.
D Implement input validation on the API.

While investigating a security event, an analyst finds evidence that a user opened an email attachment from an unknown source. Shortly after the user opened the attachment, a group of servers experienced a large amount of network and resource activity. Upon investigating the servers, the analyst discovers the servers were encrypted by ransomware that is demanding payment within 48 hours or all data will be destroyed. The company has no response plans for ransomware.
Which of the following is the NEXT step the analyst should take after reporting the incident to the management team?

• A. Pay the ransom within 48 hours.
• B. Isolate the servers to prevent the spread.
• C. Notify law enforcement.
• D. Request that the affected servers be restored immediately.

Note : one source is saying B and other source is saying C ... i am confused . Please help to guide with the correct information 

An organization developed a social media application that is used by customers in multiple remote geographic locations around the world. The organization's headquarters and only datacenter are located in New York City. The Chief Information Security Officer wants to ensure the following requirements are met for the social media application:

Low latency for all mobile users to improve the users' experience

SSL offloading to improve web server performance

Protection against DoS and DDoS attacks

High availability

Which of the following should the organization implement to BEST ensure all requirements are met?

Options:
A. A cache server farm in its datacenter
B. A load-balanced group of reverse proxy servers with SSL acceleration
C. A CDN with the origin set to its datacenter
D. Dual gigabit-speed Internet connections with managed DDoS prevention