Explanation:
Oracle Shared Server is an improved version of multithreaded server configuration.
Incorrect Answers:
2: Oracle Shared Server does not provide configuration where several clients are connected to the same server process.
3: Oracle Shared Server does not include two or more database servers, which share data by means of database links.
4: Oracle Shared Server is not a configuration of Real Application Clusters where the client connection is routed to the least busy instance.
Reference:
OCP Oracle9i Database: New Features for Administrators, Daniel Benjamin, p. 144-152 Chapter 3: Manageability Enhancements
Oracle 9i New Features, Robert Freeman, p. 59-60
Chapter 2: Oracle9i Architecture Changes

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