2. What is the output of the following C++ code, given the input data 5, 6, 3 and 1? #include using namespace std; struct PersonNode int SocSecNum; PersonNode Next; ); int main() int SSNumber; I PersonNode* ptr; PersonNode head NULL; cout < < "Please enter the identification number " < < endl; cout < < "or 'a' to end the data entry:" < < endl; cin >> SSNumber; while (cin) ptr new PersonNode; ptr->SocSecNum SSNumber; ptr->Next head; head ptr; cout < < "Please enter the identification number " < < endl; cout < < "or 'a' to end the data entry:" < < endl; cin >> SSNumber; ptr = head; cout < < "Printing Listing" < < endl; while( ptr != NULL) cout < < ptr->SocSecNum; ptr ptr->Next; cout < < endl; return 0;