Question number $3$

Find the domain of the given function $f(x,y,z)=\frac{-z^2}{\sqrt[\phantom{2}]{49x^2-9y^2}}$

$\{(x,y,z)|,|x|>\frac{3}{7}|y|\}$

$\{(x,y,z)|x\frac{3}{7}y\}$

$\{(x,y,z)|,|x|\frac{3}{7}|y|\}$

$\{(x,y,z)|,|x|\frac{3}{7}|y|\}$

$\{(x,y,z)||x|<mfrac><mrow><mn>3</mn></mrow><mrow><mn>7</mn></mrow></mfrac><mi>|</mi><mi>y</mi><mi>|</mi><mi>\}</mi>$

None of the above.