A company is using Amazon RDS as the backend database for its application. After a recent marketing campaign, a surge of read requests to the database increased the latency of data retrieval from the database.
The company has decided to implement a caching layer in front of the database. The cached content must be encrypted and must be highly available.
Which solution will meet these requirements?

A. Amazon CloudFront
B. Amazon ElastiCache for Memcached
C. Amazon ElastiCache for Redis in cluster mode
D. Amazon DynamoDB Accelerator (DAX)