1. For each of the following scenarios, choose 0, and 02 so that the resulting AR(2) process is causal. In each case use R to plot ACF and PACF of the AR(2) process and discuss the characteristics of the plots. (i) 01 >0 and 02 > 0 (ii) 01 0 (iii) 0,> 0 and 02 0 and 02 > 0 (ii) 01 0 (iii) 0,> 0 and 02