Which of the following function is used to find the first occurrence of a given string in another string?

The function strstr() Finds the first occurrence of a substring in another string Declaration: char *strstr(const char *s1, const char *s2); Return Value: On success, strstr returns a pointer to the element in s1 where s2 begins (points to s2 in s1). On error (if s2 does not occur in s1), strstr returns null. Example: #include <stdio.h> #include <string.h> int main(void) { char *str1 = "IndiaBIX", *str2 = "ia", *ptr; ptr = strstr(str1, str2); printf("The substring is: %s\n", ptr); return 0; } Output: The substring is: iaBIX