Consider the assembly code generated by the compiler for some corresponding C function. Explain what each assembly instruction does and describe what data is in the corresponding register. 4. C code: ;;;12 *a = a1*a2; Assembly for above C code (a -d): a. 000012 9804 LDR ro, (sp, #0x10] b. 000014 4378 MULS ro, r7, ro c. 000016 6240 SXTB ro,ro d. 000018 7020 STRB ro, (r4, #0] Consider the assembly code generated by the compiler for some corresponding C function. Explain what each assembly instruction does and describe what data is in the corresponding register. 4. C code: ;;;12 *a = a1*a2; Assembly for above C code (a -d): a. 000012 9804 LDR ro, (sp, #0x10] b. 000014 4378 MULS ro, r7, ro c. 000016 6240 SXTB ro,ro d. 000018 7020 STRB ro, (r4, #0]