A binary ripple counter is designed to count $(0)_{10}$ to $(64)_{10}$. Which of the following is/are the number of flip-flops required to design the counter?

The negative edge triggered $J K$ flip-flop in the Figure has $J$ and $K$ inputs tied to Logic High and a square wave of 10 cycles/second is applied to its clock $(C)$ input. The frequency of the output $Q$ (in cycles/second) is $\_\_\_\_$ .

(rounded off to two decimal places)

What is the 10 's complement of $(47)_{10}$ ?

A Boolean function, $f(x, y, z)$ with $x$ as MSB and $z$ as LSB is realized by $4: 1$ multiplexer (MUX) with select lines, $S_1$ and $S_0$ ( $S_1$ is MSB, $S_0$ is LSB) and inputs, $I_0, I_1, I_2, I_3$ as shown in the Figure.

Which of the following options is the correct expression of $f(x, y, z)$ ?