Assume A is an array and x is a variable. A and x are associated to registers $50 and Sto respectively. Which of the following C++ code is equivalent to .addi $t1,$to, 2 .sil St1,$t1, 2 . add $S1, $SO,$t1 lw $t3, 12(550) sw $t3, 0(551) Select one: A[3]=A[4+xl: A[12]=A[2+x); A[3]=A[2+x]: A[12]-A[4+x] A[2+x]=A[3]