An npn BJT has gm=38mA/v, c =1014 F, c? =1013F and DC current gain ?0=90.For this transistor fT & f? are________?

A. fT =1.47 x 1010 Hz & f? = 1.33 x 1012 Hz

B. fT =1.47 x 1010 Hz & f? = 1.64 x 108 Hz

C. fT =1.33 x 1012 Hz & f? = 1.47 x 1010 Hz

D. fT =1.64 x 108 Hz & f? = 1.47 x 1010 Hz.

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