What would be the quickest action plan that the technician could attempt to try to fix the issue with the fans?

A technician is trying to troubleshoot a server that constantly keeps raising and lowering the RPMs of the fans.

The technician investigates and finds the following:

– No errors are displayed

– No obvious log entries exist concerning temperatures

– Server cover is installed and secured

– No expansion cards are installed

What would be the quickest action plan that the technician could attempt to try to fix the issue with the fans?
A . Replace all the fans
B . Upload the latest iDRAC firmware
C . Replace the fans one at a time until the faulty fan is identified
D . Adjust the Multi Vector Cooling values