Determine which of the following discrete-time functions is different:
(a) x4[n] = δ[n – 1] + δ[n] + δ[n + 1] + δ[n + 2]
(b)
(c) x3[n] = 1 for n ∈ [–1, 0, 1, 2], and 0 otherwise
(d) x1[n] = u[n + 1] – u[n – 3]
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