Suppose r0 = 0x20008000. From which address will r7 be stored in the following instructions? What is the value of r0 after executing each instruction? Assume each instruction is being executed separately, i.e., they are not part of a program.

a) STMIA r0!, {r3, r9, r7, r1, r2}

b) STMIB r0!, {r3, r9, r7, r1, r2}

c) STMDA r0!, {r3, r9, r7, r1, r2}

d) STMDB r0!, {r3, r9, r7, r1, r2}