Consider the single$-$cycle processor below:

$($a$)$ What instruction$($s$)$ may fail to run correctly if the interconnections labeled A above have been cut? Choose the answer$($s$)$ from add, sd$,$ ld$,$ and beq.

$($b$)$ What instruction$($s$)$ would still be correct if the input signals of Read register $1$ and Read register $2$ were swapped? Choose the answer$($s$)$ from add, sd$,$ ld$,$ and beq.

$($c$)$ What control signal$($s$)$ must be set to $0$ when the program runs the instruction sd x$130($x$12)?$ What are the respective consequences if they are set to $1?$ Choose the answer$($s$)$ from Branch, MemRead, MemtoReg, MemWrite, ALUSrc, and RegWrite.