We have a digital circuit. Different parts of circuit operate at different clock frequencies (4MHZ, 2MHZ and 1MHZ), but we have a single clock source having a fix clock frequency (4MHZ), we can get help by __.

(A) Using S-R Flop-Flop
(B) D-flipflop
(C) J-K flip-flop
(D) T-Flip-Flop