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What will be the output of the following C++ code?
#include <iostream>
#include <set>
using namespace std;
int main()
{
    set<int> tst;
    tst.insert(12);
    tst.insert(21);
    tst.insert(32);
    tst.insert(31);
    set<int> :: const_iterator pos;
    for(pos = tst.begin(); pos != tst.end(); ++pos)
    cout << *pos << ' ';
    return 0;
}

Answer & Solution
Correct Answer: Option B
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