Which one of the following is the output of the circuit

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Which one of the following is the output of the circuit shown in the following figure for the given input?

1. 1
2. 2
3. 3
4. 4

Correct Option: D

For input voltage greater than 3 V the diode will conduct and
V₀ = 0 V
and for ν_in < 3 V diode will not conduct
and V₀ = (ν_in – 3) V
Hence alternative (D) is the correct choice