Which of the following safety precautions should the technician take after opening the case?

A technician receives a CRT monitor needing diagnostics. Which of the following safety precautions should the technician take after opening the case?

A.
Obtain a safety clearing from the floor supervisor.

B.
Put on an anti-static wrist strap.

C.
Ensure that the CRT has been discharged.

D.
Ensure that the grounding strap is connected to the CRT.