At what points $(x,y,z)$ in space are the functions continuous?

a$.f(x,y,z)=x^{2}2y^2-3z^2$

b$.f(x,y,z)=\sqrt[\phantom{2}]{x^2{y}^2-4}$

a$.$ At which points is $f(x,y,z)=x^{2}2y^2-3z^2$ continuous? Choose the correct answer below.

A$.$ All points except $(0,2,0)$

B$.$ All points satisfying $xyzx=y=zy=x^2{z}^3{x}^2$

$C.$ All points satisfying $xyz$

$D.$ All points satisfying $x=y=z$

$E.Al$ points satisfying $y=x^2{z}^3$

$F.$ All points

$a.No$ points