A20840. 下面哪种方式不能实现将字符串Welcome to 2026!输出重定向到文件 Log.txt（ ）。

freopen("log.txt", "w", stdout);
cout << "Welcome to 2026!" << endl;
fclose(stdout);

std::ofstream outFile("log.txt");
cout << "Welcome to 2026!" << endl;
outFile.close();

ofstream log_file("log.txt");
streambuf* org_cout = cout.rdbuf();
cout.rdbuf(log_file.rdbuf());
cout << "Welcome to 2026!" << endl;
cout.rdbuf(org_cout);

std::ofstream outFile("log.txt");
outFile << "Welcome to 2026!" << endl;
outFile.close();