What is the maximum allowable time available for connection draining on a class load balancer?

Answer options:

A.30 minutes
B.1 hour
C.2 hours
D.5 hours

Answer - B
The AWS documentation mentions the following on the specifics of connection draining
When you enable connection draining, you can specify a maximum time for the load balancer to keep connections alive before reporting the instance as de-registered. The maximum timeout value can be set between 1 and 3,600 seconds (the default is 300 seconds). When the maximum time limit is reached, the load balancer forcibly closes connections to the de-registering instance.
For more information on the ELB connection draining, please visit the link:
http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/config-conn-drain.html