Which change is needed to apply the restrictions?

Refer to the exhibit.

An organization is using an internal application for printing documents that requires a separate registration on the website.

The application allows format-free user creation, and users must match these required conditions to comply with the company’s user creation policy:

– minimum length: 3

– usernames can only use letters, numbers, dots, and underscores

– usernames cannot begin with a number

The application administrator has to manually change and track these daily to ensure compliance. An engineer is tasked to implement a script to automate the process according to the company user creation policy. The engineer implemented this piece of code within the application, but users are still able to create format-free usernames.

Which change is needed to apply the restrictions?
A . modify code to return error on restrictions def return false_user(username, minlen)
B . automate the restrictions def automate_user(username, minlen)
C . validate the restrictions, def validate_user(username, minlen)
D . modify code to force the restrictions, def force_user(username, minlen)