Question $10$ Consider the following three$-$address instructions: MUL R$1,$ R$2,$ R$3.$ What does this instruction do$?$ A$.$ Multiplies the contents of R$1$ and R$3$ and stores the result in R$2$ B$.$ Multiplies the contents of R$2$ and R$3$ and stores the result in R$1$ C$.$ Multiplies the contents of R$3$ and R$1$ and stores the result in R$2.$ D$.$ Multiplies the contents of R$1$ and R$2$ and stores the result in R$3$