.For the following MIPS code sequence and given that $a0=-1 initially, show the contents of the program counter (PC), register $ra, and the memory stack after the execution of each of the instructions marked below (point 2, point 3, point 4).

1. .text 2. main: Jal add-p + point 1 4. next0: add_p: addi $sp, sp, -8 7 8 6. sw ra, 4($sp) sw $a0, 0(Ssp) bne $a0, $zero, L1 jr Sra 10 11. L1: addi $a0, $a0, 1 12 13. next1: Iw $a0, 0(Ssp) point 3 al add_p *- point 2 lw ra, 4($sp) addi sp, $sp, 8 jr Sra 15 16 17 18. point 4 19. Point 1 20. Old top of the stack next0 ra add p 1. .text 2. main: Jal add-p + point 1 4. next0: add_p: addi $sp, sp, -8 7 8 6. sw ra, 4($sp) sw $a0, 0(Ssp) bne $a0, $zero, L1 jr Sra 10 11. L1: addi $a0, $a0, 1 12 13. next1: Iw $a0, 0(Ssp) point 3 al add_p *- point 2 lw ra, 4($sp) addi sp, $sp, 8 jr Sra 15 16 17 18. point 4 19. Point 1 20. Old top of the stack next0 ra add p