For an FM receiver with an input signal-to noise ratio for 29 dB, a noise figure of 4 dB and an FM improvement factor of 16 dB, the pre-detection and post-detection signal to-noise ratios are:
1
30 dB and 41 dB
2
30 dB and 49 dB
3
25 dB and 49 dB
4
25 dB and 41 dB