Which two are required for this command to connect the SQL*PLUS client to a database instance?

Examine this command executed on a client that is remote from the database server.
SQL> CONNECT hr/hr@orcl
Which two are required for this command to connect the SQL*PLUS client to a database instance? (Choose two.)
A. An orcl TNS entry must be defined in the client-side and server-side tnsnames.ora files
B. An orcl TNS entry must be defined in the client-side tnsnames.ora file
C. A service name must be defined to the listener that matches the service name in the orcl TNS entry
D. An orcl TNS entry must be defined in the server-side tnsnames.ora file
E. The service name orcl must be defined to the listener

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