Instruction [25-0] Add Jump address [31-0] Shift left 2 26 28 PC+4 [31-28] Shift E Add result ALU RegDst Jump left 2 Branch MemRead Instruction [31-26] MemtoReg Control ALUOP MemWrite Instruction [25-21] Read PC Read address ALUSrc RegWrite register 1 Read Instruction [20-16] data 1 Read Instruction [31-0] register 2 Write Read Instruction memory Instruction [15-11] register data 2 Write data Registers (OMX- PCSrc2 3x PCSrc1 3x B Zero ALU ALU Read Address result data D Instruction [15-0] 16 Sign- extend 32 ALU control Instruction [5-0] Write Data data memory Ox=3" A Consider the following R-format instruction: sw $t1, 4 ($s4) Which resources perform a useful function for this instruction (i.e., computes data necessary for proper execution of the instruction)? Mark an 'X' in the correct column for each component. Component Sign-extend (D in figure) Add (E in figure) ALU Data Memory Useful Not useful