What Is the Difference Between the Dickey-Fuller Tests 1,2,and 3 $\rho$

Multiple Choice

What is the difference between the Dickey-Fuller Tests 1,2,and 3?

A) they test for stationarity around zero,stationarity around a constant,and stationarity around a trend line,respectively
B) they test $\rho$ <1, $\rho$ >1,and $\rho$ =1,respectively
C) they use t, $\tau$ ,and F tests,respectively
D) they test for integration of orders 1,2 and 3 respectively.