Select the sentence that correctly describes the value returned by Post$-$order$($r$),$ where r is the root of a tree.

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Post$-$order$($v$)$ Count $=0$ For every child w of v: Count $=$ Count $+1$ End$-$for For every child w of v: x :$=$ Post$-$order$($w$)$ If $($x $>$ Count$)$ Count :$=$ x End$-$for Return$($ Count $)$