A DBA has determined that he or she can Telnet from a client to the database server but is unable to connect using Net8. Which utility should be used next to determine connectivity to an Oracle service on the server?

A. NETSTAT
B. TNSPING
C. LSNRCTL
D. ADAPTERS

C or D, which one is right? I think C is right. We should check if listener is running before try to use tnsping. Agree?