Given that a shape is a parallelogram, which of the following is sufficient to state that it is also a rectangle?
AThe opposite sides are of equal length.
BThe diagonals are of equal length.
CThe opposite sides are parallel.
DThe diagonals bisect each other.
AThe opposite sides are of equal length.
BThe diagonals are of equal length.
CThe opposite sides are parallel.
DThe diagonals bisect each other.