In your implementation of Lab 4, which answer best represents the code used to open donation_record.txt?

1. std::fstream file1("donation_total.txt", std::ios_base::trunc);

2.std::ofstream file1("donation_total.txt");

3.std::fstream file1("donation_total.txt", std::ios_base::app);

4.std::ifstream file1("donation_total.txt", std::ios_base::trunc);

2---Which is the correct way to extract a donation amount from a string with the format "[Name] [Amount]"?

Assume that stream is a stringstream object that was initialized as such: std::stringstream stream(str);

1.stream >> amount;

2.stream >> name >> amount;

3.name >> amount >> stream;

4.name << amount << stream;