If Data Replication Is Permitted in a Distributed Database Network

Multiple Choice

If data replication is permitted in a distributed database network ____.

A) one site must contain a copy of every table
B) the maximum number of copies that can be made of any one table is equal to half the number of computers (sites) on the network
C) distributed joins are never necessary
D) copies of tables can be located at the sites that most heavily use them
E) a copy of every table must be placed at every site