1) For each of the following processes, identify it using the notation SARIMA(p, d, q) × (P,D, Q)s. Make sure to specify p-, D-, 0-, and 0- coefficients, if any. (A) Quarterly process {X;}: Xt = 0.5X÷-1 + Xt-4 – 0.5Xt-5 + Zt – 0.3Zț-1 (B) Monthly 0.25Z{-13 {X;}: X; = Xt-1+Xt-12 – Xt-13 +Z¢ – 0.5Z;-1 – 0.5Z;-12 + process (C) Monthly process {Xt}: X¢ = 1.6X¢-1 – 0.7Xt-2 + 0.8Xt-12 – 1.28X;-13 + 0.56X;-14 +

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