Which of the following is true about database schemas

(A). The physical schema dictates how data is stored in the actual storage systems, specifying the format of files and indices.

(B). The logical database schema defines the logical constraints and structures applied to stored data.

(C). The view schema focuses on the design of user interfaces that facilitate interaction between end-users and the database.

(D). A database schema is a logical representation of data that shows how the data in a database should be stored logically.