Find the GCF $64 \mathrm{a}^{9} \mathrm{~b}^{3}, 40 \mathrm{a}^ 6 \mathrm{~b}^{9}$ A) $4 a^{3} b^{6}$

Multiple Choice

Find the GCF.
- $64 \mathrm{a}^{9} \mathrm{~b}^{3}, 40 \mathrm{a}^ 6 \mathrm{~b}^{9}$

A) $4 a^{3} b^{6}$
B) $8 a^{6} b^{3}$
C) $8 a^{9} b^{9}$
D) $320 \mathrm{a} 9 \mathrm{~b}$