What Is the Point Group of a AB₂ Molecule

What is the point group of a AB₂ molecule?

A) If the molecule is linear, the point group is D_∞h, but if it is bent then the point group is C_2v.
B) If the molecule is linear, the point group is C_∞h, but if it is bent then the point group is D_2h.
C) If the molecule is linear, the point group is C_∞h, but if it is bent then the point group is D_∞h.