Q2 [4pts] Let 1121,1112, . . ., be white noises. The above four plots are two plots of the original time series and two ACF plots for two time series from the following 4 time series: act = 101+ 0.5w;_1, 1 S t 5 1000 11:; = w; + 0.511);_1, 1 5 t 5 10000 ) 9:; =0.7:1:;_1+wt, 13151000 ) xt = 1.01$t_1 +10\" 13 t 5 1000 05293; ( ( ( ( U For each plot, please match it with one corresponding time series (that is, choose A, B, C, or D in below) and specify whether it is an ACF plot or plot of the original time series (circle one). Your answer: ACF plot or original series plot circle one ( l ( l ( ) ACF plot or original series plot ( ) Plot(3) : ACF plot or original series plot (circle one) ( ) (circle one) ACF plot or original series plot