Point O is between points G and D on line m. Which of the following statements is not necessarily true?
AO, G and D are collinear.
BO, G and D are coplanar.
CGO + OD = GD
DGO = OD
AO, G and D are collinear.
BO, G and D are coplanar.
CGO + OD = GD
DGO = OD