The even part of a function x[n] = u[n] – u[n – 4]

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The even part of a function x[n] = u[n] – u[n – 4] is

1. 1/2 {1 + δ[n] – u[n – 4] – u[– n – 4]}
2. 1/2 {u[n + 3] – u[n – 4] + δ[n]}
3. 1/2 {u[n] + u[– n] – u [n – 4] – u[– n – 4]}
4. all of these

Correct Option: D

All describe the even part of x