Problem 3 1. The following sequence of steps in the instruction cycle PCMAR MDRIR If A=0 Then IR [address] PC Else PC+1PC What instruction does it represent? The possibilities are: LDA, STO, SUB, ADD, IN, OUT, HLT, BR, BRP, and BRZ. 2. The following sequence of steps in the instruction cycle PCMAR MDRIR If A0 Then IR [address] PC Else PC+1PC What instruction does it represent? 3. The following sequence of steps in the instruction cycle PCMAR MDRIR In-basket A PC+1PC What instruction does it represent? 4. The following sequence of steps in the instruction cycle PCMAR MDRIR IR [address] MAR A+MDRA PC+1PC What instruction does it represent