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Which of the following statements are correct about the program below?

 #include
 
  int main() 
  {   
       char str[20], *s;     
       printf("Enter a string\n");     
       scanf("%s", str); 
       s=str;    
       while(*s != '\0')  
       {        
           if(*s >= 97 && *s 122)             
               *s = *s-32;         
            s++;  
       }   
       printf("%s",str);  
       return 0;
  }