Which three best practices should UC consider for Release Management?

Universal Containers (UC) is considering updating their Salesforce Release Management process.

Which three best practices should UC consider for Release Management? Choose 3 answers
A . Design the right sandbox strategy for the release.
B. Release sign-off is only required for Production.
C. Regression testing is mandatory for each release.
D. Maintain a pre/post deployment checklist for each release.
E. Publish a release calendar for each phase of the release.

Answer: A,D,E