What is a possible solution to prevent this happening?

You have written an application that uses the Elastic Load Balancing service to spread
traffic to several web servers Your users complain that they are sometimes forced to login
again in the middle of using your application, after they have already togged in. This is not
behavior you have designed. What is a possible solution to prevent this happening?

A.
Use instance memory to save session state.

B.
Use instance storage to save session state.

C.
Use EBS to save session state

D.
Use ElastiCache to save session state.

E.
Use Glacier to save session slate.