Consider the following code. void f1 (int* ptr2) { int* ptr3; ptr3 } ... H }; int main() { new int [20]; delete [] ptr3; int* ptr1; f1 (ptr1); return 0; It does not cause memory leak We need to add the following line to the main function: delete ptr1; ptr1 must be declared as a constant pointer for the code to work We need to add the following line to the f1 function: delete ptr2;