An application is using a single-node Amazon ElastiCache for Redis instance to improve read performance. Over time, demand for the application has increased exponentially, which has increased the load on the ElastiCache instance. It is critical that this cache layer handles the load and is resilient in case of node failures.
What can the Developer do to address the load and resiliency requirements?

A. Add a read replica instance.
B. Migrate to a Memcached cluster.
C. Migrate to an Amazon Elasticsearch Service cluster.
D. Vertically scale the ElastiCache instance.