All of the Following Are True When There Is Targeted

Multiple Choice

All of the following are true when there is targeted data replication on a distributed database network, except ____.

A) there is no need for distributed joins because one site must have a copy of the entire database
B) a two-phase commit is necessary if all of the replicated copies of a table must be kept up-to-date all of the time
C) there is improved availability because of the data replication
D) communications costs for read-only data access are reduced because copies of tables can be located at multiple sites that most heavily use them
E) it requires a distributed directory