2. On two non-perpendicular skew lines $a, b$, there are 4 different points $A, B, C, D$, where $A \in a, B \in a, C \in b, D \in b$. For the following two propositions:
(1) The lines $A C$ and $B D$ are always skew lines;
(2) The points $A, B, C, D$ can never be the 4 vertices of a regular tetrahedron.
Which of the following propositions is correct?
A. (1)
B. (2)
C. (1)(2)
D. Neither (1) nor (2) is correct