Which of the following descriptions of Harmony OS Data Ability are correct?

A: Data Ability is used to provide a unified abstraction of data access within and between applications B: Data Ability provides interfaces for adding, deleting, modifying, querying, and opening files of data, and the specific implementation of these interfaces is provided by the system C: Data Ability can be used for data sharing between apps on the same device and across devices D: Using Data Ability helps apps manage access to data stored by themselves and other apps, and provides a way to share data with other apps