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The database instance has the following parameter setting： OS_AUTHENT_PREFIX = OPS$ OS_ROLES = FALSE  REMOTE_OS_AUTHENT = FALSE REMOTE_OS_ROLES = FALSE TIMED_OS_STATISTICS = 0  You have a local operating system user SKD. You create a database user OPS$SKD， and then  assignexternal authentication. The user OPS$SKD has the CREATE SESSION privilege.  What would youachieve by the above process（）
A:The database user OPS$SKD will be able to administer the database.
B:The authentication detail for the database user OPS$SKD is recorded in the password file.
C:The local operating system user SKD will be able to access the database instance without specifying the username and password.
D:The database user OPS$SKD has to login with the password of the local operating system user SKD to access the database instance.

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出自：Oracle认证

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