A schema describes the structure, content, and access controls of a physical data store or database.
Distributed databases are that are distributed across several physical locations. In distributed databases, the data are placed where they are used most often, but the whole database is available to each licensed user.
The database system is separated into three components: Query Processor, Storage Manager, and Disk Storage.
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Complete Question is ,
a. relation
b. DBMS
c. schema
d. attribute