4. Transversal E F intersects AB and CD, as shown in the diagram below.
E
1/2
4/3
A
B
5/6
8/7
D
F
Which statement could always be used to prove
AB || CD?
1
2224
2) 27 228
3) Z3 and Z6 are supplementary
4) Z1 and 25 are supplementary

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