Which two common techniques are used building a data dictionary to store information on how business entities are defined?

Universal Containers (UC) wants to capture information on how data entities are stored within the different applications and systems used within the company. For that purpose, the architecture team decided to create a data dictionary covering the main business domains within UC.

Which two common techniques are used building a data dictionary to store information on how business entities are defined?
A . Use SalesforceObject Query Language.
B. Use a data definition language.
C. Use an entity relationship diagram.
D. Use the Salesforce Metadata API.

Answer: C,D