You Have an ELB Setup in AWS with EC2 Instances

Multiple Choice

You have an ELB setup in AWS with EC2 instances running behind it. You have been requested to monitor the incoming connections to the ELB. Which of the below options can suffice this requirement?

A) Use AWSCIoudTrail with your load balancer
B) Enable access logs on the load balancer
C) Use a CloudWatch Logs Agent
D) Create a custom metric CloudWatch filter on your load balancer