Please show and explain all steps.

5. When an 8-bit or 16-bit data unit is loaded from the data memory into a 32-bit register, sign extension or zero extension should be performed depending on whether the data is signed or unsigned. (20 pts) - LDRSB (load register with signed byte) loads a signed byte and LDRB (load register with byte) loads an unsigned byte. - LDRSH (load register with signed half-word) and LDRH (load register with halfword) load a 16-bit signed and unsigned number into a register, respectively. What is the value of register rl in the following instructions if r=020004000 ? Assume the system is based on little endian. a) LDRSB r1,[r] b) LDRSH r1,[r] c) LDRB r1,[r] d) LDRH r1,[r]