You’ve just started development on an application that will make use of the ElastiCache service. You need to ensure that objects are cached but not kept inadvertently for a long time. Which of the following strategy would you employ for the cache service?

Answer options:

A.Adding TTL
B.Lazy Loading
C.Write Through
D.Read Through

Answer – A
The AWS Documentation mentions the following.
Lazy loading allows for stale data but won`t fail with empty nodes. Write through ensures that data is always fresh but may fail with empty nodes and may populate the cache with superfluous data. By adding a time to live (TTL) value to each write, we can enjoy the advantages of each strategy and largely avoid cluttering up the cache with superfluous data.
Option B is incorrect because this is a caching strategy that loads data into the cache only when necessary.
Option C is incorrect because this is a caching strategy that adds data or updates data in the cache whenever data is written to the database.
Option D is incorrect because there is no such caching strategy.
For more information on Caching strategies, please refer to the below URL-
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/Strategies.html