What is the primary purpose of writing the updated user$\_$data$\_$list to an output file in the process of replacing old domain names with new ones in a CSV file using Python, as described in the lab?

To save the changes made to the email addresses and create a new CSV file with updated data

To define headers for the output file to help organize the information when opened in a spreadsheet

To store a backup of the original user data

To close the CSV file after reading to ensure no further changes can be made to it