If Yt is I(2), then a. $\Delta ^ { 2 } Y _ { t }$ is stationary.
b. $Y _ { t }$ has a unit autoregressive root.
c. $\Delta Y _ { t }$ is stationary.
d. $Y _ { t }$ is stationary.

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The Answer of If Yt is I(2), then a. $\Delta ^ { 2 } Y _ { t }$ is stationary.
b. $Y _ { t }$ has a unit autoregressive root.
c. $\Delta Y _ { t }$ is stationary.
d. $Y _ { t }$ is stationary.

If Yt Is I(2), Then A Δ2Yt\Delta ^ { 2 } Y _ { t }Δ2Yt​

If Yt Is I(2), Then A $\Delta ^ { 2 } Y _ { t }$