Which authentication method would be used first?（） 
（单选题）
In your database, the LDAP_DIRECTORY_SYSAUTH initialization parameter has been set to YES and the users who need to access the database as DBAs have been granted SYSDBA enterprise role in Oracle Internet Directory (OID). SSL and the password file have been configured. A user SCOTT with the SYSDBA privilege tries to connect to the database instance from a remote machine using the command: 
Which authentication method would be used first?（）
Aauthentication by password file
Bauthentication by using certificates over SSL
Cauthentication by using the Oracle Internet Directory
Dauthentication by using the local OS of the database server
正确答案
答案解析
略
