Which of the following function is correct that finds the length of a string? int xstrlen(char *s){

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Which of the following function is correct that finds the length of a string?

int xstrlen(char *s){ int length=0; while(*s!='0') { length++; s++; } return (length);}int xstrlen(char s){ int length=0; while(*s!='0') length++; s++; return (length);}int xstrlen(char *s){ int length=0; while(*s!='0') length++; return (length);}int xstrlen(char *s){ int length=0; while(*s!='0') s++; return (length);}