The customer has an indexer cluster supporting a wide variety of search needs, including scheduled search, data model acceleration, and summary indexing. Here is an excerpt from the cluster mater’s server.conf:

Which strategy represents the minimum and least disruptive change necessary to protect the searchability of the indexer cluster in case of indexer failure?

A. Enable maintenance mode on the CM to prevent excessive fix-up and bring the failed indexer back online.
B. Leave replication_factor=2, increase search_factor=2 and enable summary_replication.
C. Convert the cluster to multi-site and modify the server.conf to be site_replication_factor=2, site_search_factor=2.

D. Increase replication_factor=3, search_factor=2 to protect the data, and allow there to always be a searchable copy.