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Assume A is an array and x is a variable. A and x are associated to registers $50 and $t0 respectively. Which of the following C++ code is equivalent to: addi $t1, $t0, 2 sll $t1, $t1, 2 add $S1, $50, $t1 lw $t3, 12($SO) sw $t3, 0($S1) Select one: O A[2+x] =A[3]; O A[3]=A[2+x]; O A[12]=A[4+x]; O A[3]=A[4+x]; O A[12]=A[2+x]