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Identify each description of a quadrilateral as one of the following.
I. a characteristic of parallelograms
II. a condition ensuring a quadrilateral is a parallelogram
III. both I and II
Iv. Neither I nor II

a. two pairs of congruent opposite sides

b. two pairs of congruent opposite angles [III]

c. two pairs of consecutive sides are congruent

d. four congruent angles e. one pair of parallel sides and a pair of congruent opposite sides​