Understanding One Stage of Arithmetic Logic Shift Unit ALU || Lesson 12 ||Computer Organization

Here we will have Understanding One Stage of Arithmetic Logic Shift Unit ALU.
The complete concepts of arithmetic logical and shift units will be combined into one single unit.
The circuit that we will understand in this video is for one stage of the arithmetic logic shift unit.
In short, we call it ALU.

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[samipgnyawali]

sir in s3, s2 =0, 0(arithmatic operation-understood) and s0, s1 =0, 0 and cin 0 how does it gets to transfer of A?? we have to memorize it ?? referring arithmetic logic unit video tells that s0, s1-0, 0 cin=0 gives Ai+Bi not clear please help