4. (25 points) Implement the following loop. As in previous questions, assume "X", "Y" and Z"are 16-bit variables in memory that can be accessed by name. Recall that a while loop is a more general type of loop than the for loop scen in question 2 -a while loop simply repeats the loop body as long as the condition tested at the beginning of the loop is true. while f(Y0) &&(X 0))