Which two locking behaviors will occur during a deployment?

Universal Containers is validating an outbound change set from the Developer Sandbox to the production org.

Which two locking behaviors will occur during a deployment? Choose 2 answers
A . The production org will be locked. Administrators cannot modify metadata during this time
B. The sandbox org will be locked. Administrators cannot modify metadata
C. The production org will be locked. Users can only Read data during this time
D. The production org will be locked. Users will still be able to Read/Write data to the org

Answer: A,D