Which statement is true regarding accessing the Enterprise Manager Database Control?

Which statement is true regarding accessing the Enterprise Manager Database Control?

A.
It can be accessed through a Web browser or command line.

B.
It can beaccessed only it thedefault preset port number1158 is available.

C.
It can be accessed Irrespective of whether the database instance shut down or running.

D.
It can be accessed only it the Net service names have been configured in the server
tnsnames.ora file.

Explanation: