Q. 4. a. Write a DLX assembly code fragment (not a complete program) that sums all the elements ofan integer array. Use register indirect addressing only for the array. Assume the base address of the array has been assigned to register R1 before the entry to the fragment, and the number of elements in the array has been assigned to register R2. Compute the sum of all the elements into register R3. Use no additional registers in contains at least one element. complete all parts and show work b. Re-do part a, but this time using only "based-index addressing" for the array. Assume such a mode is added to DLX using a load instruction of the form LW Rx, Ry(Rz) having the semantic Rx