In the process of updating email domains in a CSV file using Python, how do the contains_domain and replace_domain functions work together?
A. contains_domain encrypts the email addresses, and replace_domain decrypts them back to their original form.
B. contains_domain deletes email addresses with outdated domains, and replace_domain creates new email addresses from scratch.
C. contains_domain uses a regular expression to identify emails with a specific domain, and replace_domain replaces these domains with new ones.
D. Contains_domain sorts the email addresses, and replace_domain reverses their order.
