A cell phone transmits at a powerlevel of 800 mW with an antenna gain of 3.0 dB. The cell tower has an antenna gain of 10.0 dB and is at a distance of 5 km away. Transmission frequency is 600 MHz. Noise level at Receiver Input is -95 dBm and required Signal to Noise ratio to close the link is 5 dB. Find the link margin in dB. (assume $$\pi^2 = 10$$)

A

150 dB

B

60 dB

C

30 dB

D

35 dB