What is true about the following statement?
```
out.open("values.dat", ios::app);
```
a. If the file already exists, its contents are preserved and all output is written to the end of the file.
b. If the file already exists, it should be replaced with a new copy of values.dat.
c. If the file already exists, it can be opened but not modified.
d. None of these
a. If the file already exists, its contents are preserved and all output is written to the end of the file.
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