When designing these forms, which two techniques will help maintain a high level of data quality?

Universal Containers has a public website with several forms that create Lead records in Salesforce using the REST API.

When designing these forms, which two techniques will help maintain a high level of data quality?
A . Do client-side validation of phone number and email field formats.
B . Prefer picklist form fields over free text fields, where possible.
C . Ensure the website visitor is browsing using an HTTPS connection.
D . Use cookies to track when visitors submit multiple forms.

Answer: A,B