By seeing which operator thus this program stops getting

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By seeing which operator thus this program stops getting the input?

#include <iostream>
    #include <fstream>
    using namespace std;
    int main ()
    {
        char ch;
        streambuf * pbuf;
        ofstream os ("Example.txt");
        pbuf = os.rdbuf();
        do {
            ch = cin.get();
            pbuf -> sputc(ch);
        } while (ch != '.');
        os.close();
        return 0;
    }

1. $ symbol
2. dot operator
3. insertion operator
4. All of above
5. None of these

Correct Option: B

This program will stop getting the input, When it occurs the dot(.) operator.