Consider the following C program:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
double* f(double* q) {
    q = malloc(sizeof(double));
    *q = log(3.0); // 1.098612
    return q;
}
int main(void) {
    double x = 9.8;
    double* ptr1 = &x;
    double* ptr2 = f(ptr1);
    printf("%f\n", *ptr2);
    free(ptr1);
    return 0;
}

Tick all the correct statements.