points each $1.$ We do not discuss the datapath for I$-$type instructions like ADDI or ANDI.$($a$)$ What additional logic blocks, if any, are needed to add I$-$type instructions to the CPU shown in the following figure $($Figure $4\mathrm{.}23$ in the textbook$)?$ Add any necessary logic blocks to it and explain their purpose.$($b$)$ Show the dataflow for this instruction using dash lines on the following figure $($c$)$ List the values of the signals generated by the control unit for ADDI. Explain the reasoning for any dont care control signals.