What is meant the description "antiparallel" regarding the strands that make up dna?

a) the twisting nature dna creates nonparallel strands.
b) the 5' to 3' direction of the other strand runs counter to the 5' to 3' direction of the other strand.
c) base pairings create unequal spacing between the two dna strands.
d) one strand is positively charged and the other is negatively charged.
e) one strand contains only purines and the other contains only .