23. Consider an FM signal \(f(t)=\cos[2\pi f_ct+\beta_1 \sin 2\pi f_1t+\beta_2 \sin2\pi f_2t]\) . The maximum deviation of the instantaneous frequency from the carrier frequency fc is   ( ) 1 1 2 2 A f f β +β ( ) 1 2 2 1 B f f β +β ( ) 1 2 C β +β ( ) 1 2 D f

(A) β1f12f2

(B) β1f22f1

(C) β12

(D) f1+f2

Hint: 

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