Which two actions should Cloud Kicks take to improve data quality?

Cloud Kicks stores Invoice records in a custom object. Invoice records are being sent to the Accounting department with missing States and incorrectly formatted Postal Codes.

Which two actions should Cloud Kicks take to improve data quality? (Choose two.)
A . Change each address field to required on the Page Layout.
B. Write an Apex Trigger to require all fields to be populated.
C. Utilize a Validation Rule with a REGEX operator on Postal Code.
D. Utilize a Validation Rule with a CONTAINS operator on address fields.

Answer: C,D