Four Right Angles in a Plane

Which term is defined as two intersecting lines that form four right angles in a plane?
A.)  skew lines
B.)  straight lines
C.)  parallel lines
​D.)  perpendicular lines

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Oh, come on.  Easy peasy.

​D.)  Perpendicular lines

As for the others:
skew lines

• two or more lines which have no intersections, but are not parallel

straight lines

• well, they are straight if they are lines, but not the best answer

parallel lines

• ​two lines which have no point or points of intersection

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