Which arithmetic expression represents a valid subtree of the following tree?

ubrace$(-$ubrace$)$

ubrace$(-$ubrace$)$

Note: This is a Multi$-$Select questiea: Chosse all that apply.

$\sqrt[\phantom{2}]{x-2}$

$\sqrt[\phantom{2}]{x}$

$x^2$

$\frac{x^2}{log(x)}$