Before Watson and Crick Described DNA Structure, Linus Pauling Proposed

Before Watson and Crick described DNA structure, Linus Pauling proposed a possible model with three strands of support running down the middle and the bases extending out the sides. How did Pauling's model differ from Watson and Crick's?

A) He missed the number of support strands which was two rather than three.
B) The support strands ran along the outside rather than down the center.
C) The bases were paired in the middle rather than sticking out the sides.
D) All of the choices describe how Pauling's model was different than Watson and Crick's model.