Question $9($Mandatory$)(7\mathrm{.}5$ points$)$

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What is the best choice for the header line of a method that returns the number of vowels in a sentence?

Question $9$ options:

String getVowels $($String S$)$

int numberVowels $($String Sentence$)$

void numberVowels $($String Word$)$

char Vowels $($String S$)$