HELP!! Which of the following information would prove the quadrilateral ABCD is a rectangle?

Slope of AB = 2, slope of BC = -1/2

Slope of CD = 2, slope of DA = -1/2

Note how the slopes of AB and BC are negative reciprocals. Multiplying 2 and -1/2 together will result in -1. This shows us that AB is perpendicular to BC. Perpendicular slopes always multiply to -1 (assuming neither line is vertical). The same can be said about CD and DA as well. The segments being perpendicular mean we have four right (or 90 degree) angles forming. A rectangle is defined as a quadrilateral with four right angles.

what level of math? also i don't need to be paid if i can you.