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What is the difference between r+ and w+ modes?

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What is the difference between r+ and w+ modes?

(a) no difference

(b) in r+ the pointer is initially placed at the beginning of the file and the pointer is at the end for w+

(c) in w+ the pointer is initially placed at the beginning of the file and the pointer is at the end for r+

(d) depends on the operating system

This question was addressed to me in semester exam.

Query is from Files in chapter Regular Expressions and Files of Python

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Correct choice is (b) in r+ the pointer is initially placed at the beginning of the file and the pointer is at the end for w+

The explanation: none.

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