Full Subtractor:
A full subtractor is a combinational circuit that performs subtraction of three binary bits: A, B, and Borrow-In (Bin). It generates two outputs: Difference (Diff) and Borrow-Out (Bout). The full subtractor takes into account the borrow from the previous bit.

Half Adder:
A half adder is a combinational circuit that performs addition of two binary bits: A and B. It generates two outputs: Sum (S) and Carry (C). However, a half adder does not consider the carry from the previous bit.

Full Adder:
A full adder is a combinational circuit that performs addition of three binary bits: A, B, and Carry-In (Cin). It generates two outputs: Sum (S) and Carry-Out (Cout). The full adder takes into account the carry from the previous bit.

Half Subtractor:
A half subtractor is a combinational circuit that performs subtraction of two binary bits: A and B. It generates two outputs: Difference (Diff) and Borrow (B). However, a half subtractor does not consider the borrow from the previous bit.

Decoder:
A decoder is a combinational circuit that converts a binary code into a set of output signals. It has multiple inputs and multiple outputs. The outputs are activated based on the input combination.

Explanation:
A full subtractor is capable of performing subtraction of three binary bits: A, B, and the borrow from the previous bit (Bin). It generates two outputs: Difference (Diff) and Borrow-Out (Bout). The full subtractor takes into account the borrow from the previous bit, making it similar to a full adder.

The output of a full subtractor is the same as that of a full adder because both circuits consider the carry or borrow from the previous bit. In a full subtractor, the borrow-In (Bin) is equivalent to the carry-In (Cin) of a full adder.

Hence, the output of a full subtractor is the same as that of a full adder (option B) because both circuits consider the carry or borrow from the previous bit.