Explanation:
Oracle allows you to multiplex your archived redo logs by specifying a few new init.ora parameters. Some of them are LOG_ARCHIVE_DUPLEX_DEST and LOG_ARCHIVE_DEST_n, and it is used to identify the second and other locations where Oracle will store copies of archived redo logs. You can set these parameters to a directory in your file system other than the one specified for LOG_ARCHIVE_DEST and LOG_ARCHIVE_DEST_n, or to a device name.
Incorrect Answers:
1: A Net8 listener name cannot be used as the LOG_ARCHIVE_DEST_n parameter.
2: Not only local directory can be used for the LOG_ARCHIVE_DEST_n parameter.
3: Not only a Net8 alias for a remote database can be used for the LOG_ARCHIVE_DEST_n parameter.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 577-585
Chapter 12: Overview of Backup and Recovery

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