Oracle Exam 1Z0-102 Topic 2 Question 4 Discussion

A Node Manager process is not associated with a specific WebLogic domain but with a machine. You can use the same Node Manager process to control server instances in any WebLogic Server domain, as long as the server instances reside on the same machine as the Node Manager process.

Incorrect answers:

A: A cluster is part of a particular WebLogic Server domain.

D: In each domain, one WebLogic Server instance acts as the Administration Server---the server instance which configures, manages, and monitors all other server instances and resources in the domain. Each Administration Server manages one domain only. If a domain contains multiple clusters, each cluster in the domain has the same Administration Server.

http://docs.oracle.com/cd/E11035_01/wls100/cluster/overview.html