a. Match each of the three models ((1) to (3)) to the Residual Plots: Figure 1. Residuals 2000000 1500000 1000000 500000 -500000 yury -1000000 -1500000 -2000000 -2500000 Apr-01 Sep-02 Jan-04 May-05 Oct-06 Feb-08 Jul-09 Nov-10 Apr-12 Aug-13 Figure 2. Residuals 3000000 2000000 1000000 -1000000 -2000000 -3000000 M -4000000 Apr-01 Sep-02 Jan-04 May-05 Oct-06 Feb-08 Jul-09 Nov-10 Apr-12 Aug-13 Figure 3. Residuals 4000000 3000000 2000000 1000000 0 -1000000 -2000000 -3000000 -4000000 Apr-01 Sep-02 Jan-04 May-05 Oct-06 Feb-08 Jul-09 Nov-10 Apr-12 Aug-13 Figure 1: Regression Figure 2: Regression Figure 3: Regression