Which is the correct form of model to test the stationarity of a time series through Dicky - Fuller test?

1
\(y_t=\lambda_{t-1}+\mu_t\)
2
\(y_t=y_{t-1}+\lambda \mu_t\)
3
\(y_t=\lambda_{t+1}+\mu_t\)
4
\(\Delta y_t=\lambda y_{t-1}+\mu_t\)

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