To open an output file and add to the end of the data already in the file you would write
A) outFile.open"project.txt");
B) outFile.append"project.txt");
C) outFile.open"project.txt", append);
D) outFile.open"project.txt", ios::app);

Question

Quizplus · Accepted Answer

Option D is the best choice because it uses the ios::app flag to open the file in append mode, which means that any new data written to the file will be added to the end of the existing data, rather than overwriting it. This is the most efficient and reliable way to append data to a file.

To Open an Output File and Add to the End