What is the output of this program?#include <iostream>

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What is the output of this program?

#include <iostream>
    #include <set>
    using namespace std;
    int main ()
    {
        multiset<int> MultisetData;
        for (int k = 0; k < 6; k++) MultisetData.insert(k);
        multiset :: key_compare compare = MultisetData.key_comp();
        int highest = *MultisetData.rbegin();
        multiset :: iterator Iter = MultisetData.begin();
        do 
        {
            cout << ' ' << *Iter;
        } while (compare(*Iter++, highest));
        return 0;
    }

1. 0 1 2 3 4 5
2. 0 1 2 3 4
3. 0 1 2 3
4. 0 1 2
5. 0 1

Correct Option: A

In this program, We used the set template and then we compared the keys and printing the result.