Question: What is the function of the mode ' w + ' ? create text file for writing, discard previous contents if any create text file

What is the function of the mode 'w+'?
create text file for writing, discard previous contents if any
create text file for update, discard previous contents if any
create text file for writing, do not discard previous contents if any
create text file for update, do not discard previous contents if any
What is the function of the mode 'w+'? create text file

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