Which are true regarding the statement "a quadrilateral having exactly one pair of parallel opposite sides is a trapezoid”? check all that apply. a. it is a conditional statement that can be written as “if a quadrilateral has exactly one pair of parallel opposite sides, then it is a trapezoid.” b. the hypothesis is: a quadrilateral having exactly one pair of parallel opposite sides. c. the hypothesis is: it is a trapezoid. d. the conclusion is: a quadrilateral having exactly one pair of parallel opposite sides. e. the conclusion is: it is a trapezoid.