Which of the following statements is NOT true?

Choose one of the following answers.

Python virtual environments are isolated from the main system, and therefore, installing a third$-$party package in a virtual environment is considered safe.

By using Python virtual environments, we can work concurrently on multiple Python projects having different package requirements in a single system.

Without using Python virtual environments, it is troublesome to install two different versions of the same Python package in a single system.

The performance of a Python programme improves significantly, if it is executed within a virtual environment.