Which of the following should have been used when initially replacing the riser?

A technician has replaced a riser inside a server and the riser is failing again after reboot. Which of
the following should have been used when initially replacing the riser?

A.
Compressed air

B.
Vacuum cleaner

C.
Proper cable management

D.
ESD mat

Explanation:

http://en.wikipedia.org/wiki/Antistatic_mat