In Amazon ElastiCache, the Failure of a Single Cache Node

In Amazon ElastiCache, the failure of a single cache node can have an impact on the availability of your application and the load on your back-end database while ElastiCache provisions a replacement for the failed cache node and it get repopulated. Which of the following is a solution to reduce this potential availability impact?

A) Spread your memory and compute capacity over fewer number of cache nodes, each with smaller capacity.
B) Spread your memory and compute capacity over a larger number of cache nodes, each with smaller capacity.
C) Include fewer number of high capacity nodes.
D) Include a larger number of cache nodes, each with high capacity.