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Question :-

A database administrator needs to create a federated database and configure access to join data from 3 Oracle instances, 2 SQL Server instances, and 1 DB2 database. Which objects are needed to establish the specified connections?
3 Oracle servers, 1 Oracle wrapper, 2 SQL Server servers, 1 SQL Server wrapper, and nicknames for all databases.
3 Oracle servers, 3 Oracle wrappers, 2 SQL Server servers, 2 SQL Server wrappers, and nicknames for all databases.
3 Oracle servers, 1 Oracle wrapper, 2 SQL Server servers, 1 SQL Server wrapper, 1 DB2 server, 1 DB2 wrapper, and nicknames for alldatabases.
3 Oracle servers, 3 Oracle wrappers, 2 SQL Server servers, 2 SQL Server wrappers, 1 DB2 server, 1 DB2 wrapper, and nicknames for alldatabases.

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