What is the greatest common factor?
2 . 5 . 7
2 . 2 . 3 . 11
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a) 2
b) 2 . 5 . 7
c) 2 . 2 . 3 . 11
d 2 . 3 . 5 . 7 . 11
e) 2 . 2 . 3 . 5 . 7 . 11