As an experienced technician, you are responsible for Technical Support. A customer calls to ask the best signal level and noise level for cell phone. How to respond?
A.
-40dBm signal and -90dBm noise
B.
-50dBm signal and -90dBm noise
C.
-30dBm signal and -90dBm noise
D.
-20dBm signal and -90dBm noise
Explanation: