Which of the following statements is correct?
(1) Two faces are parallel, and the rest of the faces are trapezoids; the geometric solid formed by these faces is a frustum.
(2) A frustum is the remaining solid after a smaller pyramid is cut off from a larger pyramid by a plane parallel to the base.
(3) Two edges of a frustum without a common vertex are skew lines.
(4) In a regular quadrilateral frustum, the lateral edges and the diagonals of the non-intersecting upper and lower bases are mutually perpendicular skew lines.
(A)(1) and (2) (B)(2) and (4) (C)(2) and (3) (D) (1) and (3)
Problem 349
Official solution
B
Translate the text above into English, please retain the original text's line breaks and format, and output the translation result directly.