The minimum inputsignal that gives outputsignal to noise ratio of 10 dB in a system that has an input impedance equal to 50 Ω, a noisefigure of 4 dB and bandwidth of 100 KHz is :

A

0.32 $$\mu V$$

B

1.41 $$\mu V$$

C

0.245 $$\mu V$$

D

NOne of the Above