下面哪种方式不能实现将字符串"Happy Spring!"输出重定向到文件log.txt（ ）。
1 freopen("log.txt", "w", stdout);
2 cout << "Happy Spring!" << endl;
3 fclose(stdout);
1 std::ofstream outFile("log.txt");
2 outFile << "Happy Spring!" << endl;
3 outFile.close();
1 std::ofstream outFile("log.txt");
2 cout << "Happy Spring!" << endl;
3 outFile.close();
1 ofstream log_file("log.txt");
2 streambuf* org_cout = cout.rdbuf();
3 cout.rdbuf(log_file.rdbuf());
4 cout << "Happy Spring!" << endl;
5 cout.rdbuf(org_cout);