Write the RISC$-$V instruction$($s$)$ that will perform the following operations on register x$15$ and

store the results in register $25.$ Only change the bits indicated; leave all other bits

unchanged.

A$.$ Clear the middle two nibbles

B$.$ Set every odd bit location

C$.$ Toggle the five most significant bits and clear the five least significant bits

D$.$ Toggle every bit value that is set