A user has created an ELB with Auto Scaling. Which of the below mentioned offerings from ELB helps the user
to stop sending new requests traffic from the load balancer to the EC2 instance when the instance is being
deregistered while continuing in-flight requests?

A.
ELB sticky session

B.
ELB deregistration check

C.
ELB connection draining

D.
ELB auto registration Off

Explanation:
The Elastic Load Balancer connection draining feature causes the load balancer to stop sending new requests
to the back-end instances when the instances are deregistering or become unhealthy, while ensuring that
inflight requests continue to be served.