How can the user add more zones to the existing ELB?

A user has created an ELB with the availability zone US-East-1A. The user wants to add more zones to ELB to achieve High Availability.

How can the user add more zones to the existing ELB?

A. The user should stop the ELB and add zones and instances as required

B. The only option is to launch instances in different zones and add to ELB

C. It is not possible to add more zones to the existing ELB

D. The user can add zones on the fly from the AWS console

Answer: D

Explanation:

The user has created an Elastic Load Balancer with the availability zone and wants to add more zones to the existing ELB. The user can do so in two ways:

From the console or CLI, add new zones to ELB;

Launch instances in a separate AZ and add instances to the existing ELB.

Reference: http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/enable-disable-az.html