The RF amplifier A is having 3 dB NF & 5 dB ofgain, amplifier B is having 3.5 dB NF & 15 dB. For overall noise figure of the cascaded system, the correct statementis :

A

A as first stage & B as second stage offers minimum overall NF

B

B as first stage & A as second stage minimum over all NF

C

Both the combination will offer same overall NF

D

Overall NF will be less than 3 dB.