Figure shows a rectangular pulse. Its unit step function

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Figure shows a rectangular pulse. Its unit step function is—

1. u (t ₁)
2. u (t ₂)
3. u (t ₁ – t ₂)
4. u (t – t ₁), – u (t – t ₂)

Correct Option: D

The given waveform can be drawn by adding to two waveform as shown below.