The minimum number of 2 to 1 multiplexers required to realize a 4 to 1 mutliplexer is

A master slave flip-flop has the characteristic that

Choose the correct one from among the alternatives A, B, C, D after matching an item from Group 1 with the most appropriate item in Group 2.

Group1
P. shift register
Q. Counter
R. Decoder

Group2
1. Frequency division
2. Addressing in memory chips
3. Serial to parallel data conversion

In the modulo-6 ripple counter shown in the figure, the output of the 2-input gate is used to clear the J-K flip-flops. The 2-input gate is