If r1 = 00FF16 and r2 = 4, what is the value of r0 after the following instruction has been executed?

a) ADD r0, r1, r1, LSL #2

b) ADD r0, r1, r1, LSL #4

c) ADD r0, r1, r1, ROR #4

Write and ARM code to implement the following C code

int s = 0;

for ( i =0 ; i < 10; i++)

s=s+i*i;