The points $$A=(6,7)$$, $$B=(7,6)$$, $$C=(-6,-7)$$, $$D=(7,-7)$$ and $$E=(7,-6)$$ are marked on a coordinate grid. Which line segment is parallel to the $$x$$-axis? 
选项为:A:$$\overline{AD}$$  B:$$\overline{BE}$$  C:$$\overline{BC}$$  D:$$\overline{CD}$$  E:$$\overline{AB}$$  请回答其中一个选项.