On the topic of the DAC (Discretionary Access Control) model, choose the statement(s) which are TRUE

On the topic of the DAC (Discretionary Access Control) model, choose the statement(s) which are TRUE.

A.
All files that do not have a specified owner cannot be modified.

B.
The system administrator is an owner of all objects.

C.
The operating system is an owner of all objects.

D.
All objects have an owner, and this owner has full control over that specific object.