Why does the DB01.abc.com service show unknown status?

Examine this command and its partial output:

Why does the DB01.vceguide.com service show unknown status?
A. The listener does not listen on the default port 1521.
B. The SID_LIST_LISTENER section is missing in the LISTENER.ORA file.
C. The service is dynamically registered.
D. The service is statically registered.
E. The LOCAL_LISTENER parameter list does not contain LISTENER_1.

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