An ecommerce site is using Amazon ElastiCache with Memcached to store session state for a web application and to cache frequently used data. For the last month, users have been complaining about performance. The metric data for the Amazon EC2 instances and the Amazon RDS instance appear normal, but the eviction count metrics are high.
What should be done to address this issue and improve performance?

A. Scale the cluster by adding additional nodes
B. Scale the cluster by adding read replicas
C. Scale the cluster by increasing CPU capacity
D. Scale the web layer by adding additional EC2 instances