A Site Has a Single Existing Search Head Which Hosts

Multiple Choice

A site has a single existing search head which hosts a mix of both CIM and non-CIM compliant applications. All of the applications are mission-critical. The customer wants to carefully control cost, but wants good ES performance. What is the best practice for installing ES?

A) Install ES on the existing search head.
B) Add a new search head and install ES on it.
C) Increase the number of CPUs and amount of memory on the search head, then install ES.
D) Delete the non-CIM-compliant apps from the search head, then install ES.