Explanation:
The multithreaded Heterogeneous Service (HS) Agents architecture has three kinds of threads: a single monitor thread, several dispatcher threads and several task threads.
Incorrect Answers:
1: The multithreaded HS Agents do not use TCP thread.
5: They do not use Shared Server thread.
6: The multithreaded HS Agents do not use Shutdown Address thread.
Reference:
OCP Oracle9i Database: New Features for Administrators, Daniel Benjamin, p. 148-150
Chapter 3: Manageability Enhancements
Oracle 9i New Features, Robert Freeman, p. 59-60
Chapter 2: Oracle9i Architecture Changes

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