To simplify users' interactions with the system, developers hide the complexity of system, database through several levels of abstraction: The Physical level describes how the data are actually stored, the Database System hides this level of detail from database programmers,Database administrators may be aware of certain details of the physical organization of the data; The abstraction level of abstraction exists to simplify their interaction with the system; （ ） describes what data are organized in the database.

A Logical level

B View level

C abstraction level

D Physical level