Which two tools should a data architect use to build custom object?

Universal Containers has a requirement to store more than 100 million records in salesforce and needs to create a custom big object to support this business requirement.

Which two tools should a data architect use to build custom object?
A . Use DX to create big object.
B. Use Metadata API to create big object.
C. Go to Big Object In setup select new to create big object.
D. Go to Object manager In setup and select new to create big object.

Answer: B,C