In three-dimensional space, if each of the two lines L1 and L2 is perpendicular to line L3, which of the following must be true?

(1) L1 is parallel to L2.
(2) L1 is perpendicular to L2.
(3) L1 and L2 lie on the same plane.

A. I only
B. I and II
C. II and III
D. III only
E. none of the above



OA E

Source: Veritas Prep