3. The digital signal x[n] 2e-02ncos (u[n] - u[n – 3]) may be expressed as the sum of impulse response functions a. x[n] = 28[n] -0.28[n – 1] +0.1258[n – 2] b. x[n] = 28[n] +1.628[n- 1] +1.38[n- 2] C. x[n] = 28[n] +1.628[n-1] +1.38[n- 2] +1.028[n – 3] d. x[n] = 28[n] -1.628[n – 1] +1.38[n – 2] %3D

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