4. þ A, B, and C. These conditions could all cause problems when using the
directory, but not when creating it.
ý D, E, and F. D is wrong because the existence of the directory is not
checked at creation time. E is wrong because while network mode does not
need a directory for the dump file(s) it will need a directory for the log file(s).
F is wrong because it confuses the issue of Oracle permissions on directories
with operating system permissions on physical paths.
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