The recommended optimal relative humidity range for computer operations
is:

A.
40% to 60%

B.
10% to 30%

C.
30% to 40%

D.
60% to 80%

Explanation:
The correct answer is C. 40% to 60% relative humidity is recommended
for safe computer operations. Too low humidity can create
static discharge problems, and too high humidity can create condensation
and electrical contact problems.