Data are geographically distributed and may move from place to place, with location transparency, users (including developers) can act as if all the data were located at a single node.If the DBMS does not directly support location transparency, a database administrator can accomplish virtual location transparency for users by create view.
To achieve location transparency, the distributed DBMS must have access to an accurate and current data dictionary/directory that indicates the location (or locations) of all data in the network. When the directories are distributed they must be synchronized so that each copy of the directory reflects the same information concerning the location of data. Although much progress has been made, true location transparency is not yet available in most distributed systems today.
So option A is correct.
