Gain and NF of a single stage amplifier is 10 dB and 3 dB respectively. When two such amplifiers cascaded then gain and NF of cascaded amplifier will be:

A

Gain : 20 dB, NF : 3.2 dB

B

Gain : 20 dB, NF : 6.0 dB

C

Gain : 13 dB, NF : 3.6 dB

D

Gain : 13 dB, NF : 6.7 dB