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（）
- AThe database user OPS$SKD will be able to administer the database.
- BThe authentication detail for the database user OPS$SKD is recorded in the password file.
- CThe local operating system user SKD will be able to access the database instance without specifying the username and password.
- DThe database user OPS$SKD has to login with the password of the local operating system user SKD to access the database instance.