Which set of vertices forms a parallelogram?
o
a.
a(2, 4), b(3, 3), c(6, 4), d(5, 6)
ob.
a(-1, 1), b(2, 2), c(5, 1), d(4,1)
oc.
d.
a(-5, -2), b(-3, 3), (13,5), d(1,0)
a(-1,2), b(1, 3), c(5, 3), d(1,1)
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