Which action should the consultant take before running the NPSP Installer?

A consultant is upgrading a non-profit client from version 2 of NPSP to version 3.

Which action should the consultant take before running the NPSP Installer?
A . Delete all fields labelled Deprecated.
B . Upgrade the Recurring Donations package by itself.
C . Delete the custom Households object.
D . Run NPSP Health Check.

Answer: D