A receiving antenna with a gain of 40 dB looks at a sky with a noise temperature of 15 K. The loss between the antenna and LNA input due to the feed horn is 0.4 dB, and the LNA has a noise temperature of 40 K. The G/T value is

A. 11.2 dB/K

B. 13.4 dB/K

C. 20.6 dB/K

D. 39.0 dB/K

Answer: Option C