The universal set is represented in a Venn diagram by ...

A: Rectangle

B: Circle

C: Oval

The correct answer is A: Rectangle.

The correct option is A.

In mathematics, a universal set is a set of all element, all the elements been considered are members of the universal set. A Venn diagram is a diagram that represents logical set pictorially as circles within an enclosing rectangles. In a venn diagram, common elements of the sets are represented by the intersection of the circles.