Which one of the following system is non-linear? [y(t)

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Which one of the following system is non-linear?
[y(t) = output; x(t) = input]

1. y(t) = 2x(t – 1) – 3x(t – 2) + x(t – 3)
2. y(t) = 5x(t)
3. y(t) = 2x(t – 1) – 3x(t – 2) – x(t – 3)
4. y(t) = 2x(t) + 3.6

Correct Option: A