can you help me with this question? im confusing about the Q2.

Time Series Specification (RW/RWD/RWDT)/Spurious Regression/Cointegration The following regressions are based on the GDP data for the period 1960-2009, for the total of 50 annual observations. AGDP = 0.4321GDP,-1 (1) (9.6427) adjusted R2 =0.301 DW=0.5259 e AGDP, = 2.82052+ 0.0451GDP,1 (2) (2.500) (2.758) adjusted Rz =0.3705 DW=0.6030 AGDP = 2.8790+ 0.6708t -0.1158GDP,-1 (3). (3. 146) (4.258) (-3.544) adjusted R2 =0.4483 DW=0.7969 1. Examining the preceding regressions, what can you say about the stationarity of the GDP time series? 2. How would you choose among the three models