Let {Ett = 0, 1, 2,...} be white noise with unit variance. Consider a process that begins at t 0 and is defined as follows: Yo = CI60; Y1 = C2Yo+ (1, and Yt = $1 Yt-1 + $2 Yt_2 + et, t = 2,3, ... What is the mean function for (Yt, t = 0, 1, 2, ...} O (cid1 + c202)t O 0 O C1 + c2 1 - 41 - 2 O None of the answers are correct