What best describes how the "jal" instruction works?Question 12Select one:a.The CPU copies the return value $1 into the backup register $ra, and then jumps to the specified target address.b.The CPU saves the address of the next instruction into register $ra, and then jumps to the specified target address.c.The CPU jumps to the specified target address.d.The target address is loaded into $ra.

In terms of the physical hardware, what is special about register $1?Question 15Select one:a.It is automatically saved by the CPU when the "jal" instruction is executed.b.It is automatically set to the return value when "jr $ra" is executedc.Nothing. Subroutines use it as the return value purely by convention.d.It is write-only.

Which of the following statements is false?Question 2Select one:a.The register $ra does not need to be backed up and restored if the subroutine does not call any other subroutine.b.A subroutine does not need to back up and restore the register $1 in any circumstances.c.The CPU will modify the value stored in $ra when "jal" is executed.d.Each subroutine has its own independent set of registers, much like local variables in C or Java.

During the _________ the opcode of the next instruction is loaded into the IR and the address portion is loaded into the MAR.Chọn thuật ngữ đúngexecute cyclefetch cycleinstruction cycleclock cycle

Briefly explain the following elements of a machine instruction.5.1. Opcode,11. Next instruction reference.

When a subroutine is called, the address of the instruction following the CALL instruction is stored in/on the a)         stack pointerb)         accumulatorc)         program counterd)         stack