E4C06 (D) 
A CW receiver with the AGC off has an equivalent input noise power density of -174 dBm/Hz.  What would be the level of an unmodulated carrier input to this receiver that would yield an audio output SNR of 0 dB in a 400 Hz noise bandwidth? 
A. 174 dBm
B. -164 dBm
C. -155 dBm
D. -148 dBm
