Four students were asked to write an expression which has terms that have a greatest common factor of ab. The expressions provided by the students are shown below. Michelle 16 a + 3 b Naomi 18 a b c minus 13 a b c Olivia 20 a b minus 14 a b c Peyton 15 a b c + 14 a b Which student wrote the correct expression? Michelle Naomi Olivia Peyton