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5. In the given Figure for an ALU for MiniMIPS, explain each of the following: (a) Why the overflow signal is formed by an XOR gate, (b) The role of the k XOR gate on the input side of the adder. Constant amount Variable amount Const'Var Amount roo No shift Shift function 01 Logical teft 10 Logical right 11 Arthright Shifter Function class An ALU for 00 Shift MiniMIPS 01 Setless 10 Arithmetic 11 Logic 5 32 5LSBS Shited y 32 GO 0.06.141 MSB XY 32 2 Shorthand symbol for ALU Control Adder Add Sub Func ALU 32 input NOR Ovis Zero Logic unit AND 00 OR 01 92 XOR 10 Logic function NOR 11 Zero OVA