$At$ what points $of{R}^{2}is$ the following function continuous?

$F(x,y)=ln(x^2+y^2-225)$

Where $is$ the function continuous? Select the correct choice and fill $in$ the answer box$(es)to$ complete your choice.

$A.\{\begin{array}{cc}(x,& y)\text{:}{x}^2+y^2\\ ?\end{array},$

$B.$ and $y>.$

$C.$ and

$D.\{\begin{array}{cc}(x,& y)\text{:}{x}^2+y^2>\\ ?\end{array},$