Find the GCF $x^{7} y^{7}, x^{6} y^{5}, x^{6} y^{6},-x^{2} y^{2}$ A) $x^{2} y^{2}$

Find the GCF.
- $x^{7} y^{7}, x^{6} y^{5}, x^{6} y^{6},-x^{2} y^{2}$

A) $x^{2} y^{2}$
B) $x^{6} y^{5}$
C) $-\mathrm{xy}$
D) $x^{5} y^{5}$