Assuming the file "File.txt" exists only in C:\users\documents\, where must it be located for this code snippet to work without error?

I have picked C:\users\documents\ and in the same folder (directory) as the source code (.cpp) and they are both INCORRECT

which of the two last ones is it?

Assuming the file "File.txt" exists only in C: \users\documents\, where must it be located for this code snippet to work without error? ifstream in_file; in_file.open("C: \users\documents \File.txt"); C: \users\documents\ In the same folder (directory) as the source code (.cpp) In the system RAM This code has errors, and will not find the file