Pick the monomials $\displaystyle{P}{\left({x},{y}\right)}\usepackage{cmbright}\Huge\$ and $\displaystyle{Q}{\left({x},{y}\right)}\usepackage{cmbright}\Huge\$ that make the following sentence true: The GCF of $\displaystyle{P}{\left({x},{y}\right)}\usepackage{cmbright}\Huge\$ and $\displaystyle{Q}{\left({x},{y}\right)}\usepackage{cmbright}\Huge\$ is $\displaystyle{15}{x}{{y}}^{{2}}\usepackage{cmbright}\Huge\$ .