Suppose the following instructions run on the processor. ld x$1,0($sp$)$ add x$7,$x$5,$x$6$ beq x$2,$ x$3,100$ What is the execution time if the processor is in single$-$cycle model? What is the execution time of the instructions in b$)$ on the pipelined processor? What is the speedup comparing to the single$-$cycle processor? $(5$ points$)$