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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);
  }

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Answer : Option A

Explanation :

Option A is the correct function to find the length of given string.

Example:

#include 
 int xstrlen(char *s) 
  {
        int length=0;  
        while(*s!='\0')  
      { length++; s++; }    
      return (length); 
  }
  int main() 
  {
     char d[] = "FRESHERGATE";  
     printf("Length = %d\n", xstrlen(d));  
     return 0; 
  }