You just realized that you have spent the last few hours accidentally adding many errors to some code that you are working on. What is the MOST effective tool to use at this point?

database manager
version control system
python emulator
stack developer

The most effective tool to use in this situation would be a version control system, such as Git, that allows you to track changes and revert to previous versions of the code. It can help you quickly identify and fix any errors that have been introduced. Additionally, it can help prevent future mistakes by allowing you to easily create branches and perform code reviews.

The most effective tool to use in this situation is a version control system.