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.