In triangle abc shown below, side ab is 10 and side ac is 8: triangle abc with segment joining point d on segment ab and point e on segment ac. which statement is needed to prove that segment de is parallel to segment bc and half its length?
a - segment ad is 5, and segment ae is 4.
b - segment ad is 4, and segment ae is 8.
c - segment ad is 4, and segment ae is 5.
d - segment ad is 5, and segment ae is 2.