Consider the following C code: long *ptr(long *arr, long i); a. (10) Implement the above function to return a pointer to arr[i] using the pointer arithmetic (i.e., do not use the \& operator) Comment your code: b. (10) Implement the above function to return a pointer to arr[i] using the \& operator. Comment your code: c. (10) Implement the above function to return a pointer to arr[i] using a single leaq instruction (or have godbolt do it for you)! Comment your code