What should an Architect advise the client about running the application on Heroku?

A client wants to migrate their on-premise application to Heroku. The application maintains a local, in-memory cache for its data store to improveperformance.

What should an Architect advise the client about running the application on Heroku?
A . The application should declare its in-memory cache as a separate process type to preserve it across deploys.
B . All of the application’s web dynos will share a single in-memory cache.
C . The application should replicate its in-memory cache to a local disk to preserve it across deploys.
D . The application’s in-memory cache might be cleared at any time.

Answer: A