What should be done to increase scheduled search capacity on the search head cluster?

A three-node search head cluster is skipping a large number of searches across time.

What should be done to increase scheduled search capacity on the search head cluster?
A . Create a job server on the cluster.
B . Add another search head to the cluster.
C . server.conf captain_is_adhoc_searchhead = true.
D . Change limits.conf value for max_searches_per_cpu to a higher value.

Answer: D