Is the DNA Double Helix Parallel or Antiparallel, and What

Multiple Choice

Is the DNA double helix parallel or antiparallel, and what does this mean?

A) It is parallel, meaning that the two strands both run alongside one another.
B) It is parallel, meaning that the base pairs are parallel.
C) It is parallel, meaning that the 5′ end of one strand is positioned opposite the 5′ end of the other strand.
D) It is antiparallel, meaning that the 5′ end of one strand is positioned opposite the 3′ end of the other strand.
E) It is antiparallel, meaning that the bases are perpendicular to the backbone.