Question

In time-series econometrics, if a variable Yₜ is non-stationary in levels but its first difference: ΔYₜ = Yₜ − Yₜ₋₁ is stationary, Yₜ is classified as:

A Trend-stationary process, TS(1)
B Integrated of order zero, I(0)
C Integrated of order one, I(1)
D An MA(1) white-noise process
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