Identify the following as specific ARIMA models. That is, what are p, d, and q and what are the values of the parameters (the 's and 0's)?

(a) Y, Y₁-1-0.25Y₁-2+ e,-0.1e-1.
(b) Y₁ = 2Y₁-1-Y₁-2 + ₁.
(c) Y,=0.5Y₁-1-0.5Y₁-2+e,-0.5e,-1+0.25e, -2. 5010