  For a semidualizing module $C$ over a ring $R$, we study the following
classes modulo exact zero divisors: $\g_C$--projectives, $\mathcal G_C$; the
Auslander class $\mathcal A_C$; the Bass class $\mathcal B_C$;
$\mathcal{P}_C$--projective; $ {\mathcal F}_C$--projective; and ${\mathcal
I}_C$--injective dimensions.
