Which of the following statements is not true? Select one: O When debugging a Flask application, the FLASK_ENV environment variable is best set to PRODUCTION. O A requirements.txt file is useful in Python development to describe a project's dependencies on third-party libraries. O The value given for Flask's FLASK_APP environment variable identifies the application to run in response to a flask run command. O A Flask application's create_app() factory method can take responsibility for creating the application for either testing or normal use. O Use of a .env file is desirable because it keeps configuration information, including secrets, out of source code.

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