What is the expected output of the following code if the file named existing_text_file is a non-zero length text file located inside the working directory?

What is the expected output of the following code if the file named existing_text_file is a non-zero length text file located inside the working directory?

A . the length of the first line from the file
B . -1
C . the number of lines contained inside the file
D . the length of the last line from the file

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Answer: B