please in need full explanation

Q26: How many cycle will the pipelined processor have to stall to execute the following instructions if there is no forwarding or hazard detection? 11 mark] AND r5, 12, 1 LW r3, 4(25) SW r2,0 (12) ADDI 13, r5, -4 SUB 13, 12, 13 SW 13, 0(15) a) 1 b) 3 c) 5 d) 7 Q27: What is the answer to question 26 if there is only forwarding and no hazard detection? 11 mark a) 0 b)! c) 2 d) 3 Q28: What is the answer to question 26 if there is both forwarding and hazard detection? [1 mark] a) 0 b) 1 c) 2 Q29: Fix the hazards in question 26 by applying compiler code scheduling. [2 marks]