Assume that r2 contains the initial value 00001000₁₆. Explain the effect of each of the following six instructions, and give the value in r2 after each instruction executes. 

a. STR b. STR C. STR d. STR r1, [12] r1, [r2, #8] r1, [r2, #8] ! r1, [r2] #8 e. STR rl, [r2, r0, LSL #8] f. STMFD r2!, {rl, r2}