The data at memory address x3500 is a bit vector with each bit representing whether a certain power plant in the area is generating electricity (bit = 1) or not (bit = 0). The program counts the number of power plants that generate electricity and stores the result at x3501. However, the program contains a mistake that prevents it from correctly counting the number of electricity generating (operational) power plants. Identify it and explain how to fix it. .ORIG x3000 AND R0, R0, #0 LD R1, NUMBITS LDI R2, VECTOR. ADD R3, R0, #1 CHECK AND R4, R2, R3 BRz NOTOPER ADD R0, R0, #1 NOTOPER ADD R3, R3, R3 ADD R1, R1, # -1 BRp CHECK STR R0, R1, #1 TRAP x25 NUMBITS .FILL #16 VECTOR. FILL x3500 .END