Which of the following combinations of gates can be used to makea clocked SR flip-flop? Assume NOT gates have one input each, allother gates have two inputs each. (One or more is true. Your answeris considered correct only if all and only the true options areselected.)
A. 4 NAND gates,2 NOR gates
B. 2 AND gates,1 OR gates,1 NAND gates,1 NOR gates
C. 1 NAND gates,4 NOR gates
D. 1 OR gates,4 NAND gates,7 NOR gates
E. None of the above