What will be the output of the following C++ code?

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
bool myfunction (int i, int j) 
{
    return (i==j);
}
int main () 
{
    int myints[] = {10, 20, 20, 20, 30, 30, 20, 20, 10};
    vector<int> myvector (myints, myints + 9);
    vector<int> :: iterator it;
    it = unique (myvector.begin(), myvector.end());                                
    myvector.resize( distance(myvector.begin(), it) );
    unique (myvector.begin(), myvector.end(), myfunction);
    for (it = myvector.begin(); it != myvector.end(); ++it)
        cout << ' ' << *it;
    return 0;
}

A. 10 20 30 20 10

B. 10 20 30

C. 30 20 10

D. 40 20 30

Answer: Option A