Quadrilateral ABCD has the following vertices: A(0, 6), B(3, 5), C(0, -4), and D(3, 5). Also, ∠B is a right angle. Is quadrilateral ABCD a rectangle, and why?

a) Yes, because opposite sides are equal in length.
b) Yes, because opposite sides are parallel and equal in length.
c) No, because only opposite sides are equal in length.
d) No, because the diagonals are not congruent.