Consider the following code :

#include<stdio.h>

void f1(char *x, char *y) {

    char *t;

    t = x;

    x = y;

    y = t;

}

void f2(char **x, char **y) {

    char *t;

    t = *x;

    *x = *y;

    *y = t;

}

int main()

{

    char *a = "ONE", *b = "TWO";

    f1(a, b);

    printf("%s %s", a, b);

    f2(&a, &b);

    printf("%s %s", a, b);

    return 0;

}
What will be the output of the above code?