Q. Consider the following iterative implementation used to reverse a string:
#include< stdio.h >
#include< string.h >
void reverse_string(char *s){
  int len = strlen(s);
  int i,j;
  i=0;
  j=len-1;
  while(______) {
   char tmp = s[i];
   s[i] = s[j];
   s[j] = tmp;
   i++;
   j--;
  }
}
Which of the following lines should be inserted to complete the above code?

• i > j
• i < len
• j > 0
• i < j

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