In a sixth-grade Math class, four students were finding the GCF of 24, 40, and 72. Omar said that the GCF is 4. Brendan said that the GCF is 8. Christopher said that the GCF is 2. Donna said that the GCF is 12. Who is correct?
A. Omar
B. Brendan
C. Christopher
D. Donna
Nope
it is 8