Respuesta :
That's right! The empty string (`''`) returned by the `read` function is an **end-of-file indicator** (choice A).
In Python, when you use a function like `read()` on a file object, it tries to read a certain number of bytes (by default, all remaining bytes). If there's no more data to be read from the file (because you've reached the end), the function returns an empty string to signal this condition.
This is a common way to loop through the contents of a file in Python. Here's an example:
```python
with open("myfile.txt", "r") as f:
line = f.readline()
while line:
# process the line
print(line, end="")
line = f.readline()
```
In this example, the `while` loop keeps iterating as long as `readline()` returns a non-empty string. When the end of the file is reached, `readline()` returns an empty string, and the loop terminates.
