What is a schema? A. defines the logic and physical structure of the database B. thoughts of why the database was created C. blueprint of the entire database structure with creators name D. collection of instructions and commands used to define and describe data

A. Defines the logic and the physical structure of the database.

Explanation:

Database schema simply defines the structural layout or the skeleton of a database defined in the formal language of its database management system. DBMS.

It simply defines the table structures, layout and other logical structure of a database.

You can say it's the technical mannual of a database!