which scenario would this command execute successfully?

Examine the command:

sqlplus /nolog
In which scenario would this command execute successfully?

A.
only from the server, if the database instance is not up

B.
from either a client or server, even if the database instance is not up

C.
from either a client or server, only if the database instance is up, and the command connects
the session to the instance

D.
from either a client or server, only if the database instance is up, but the command does not
connect the session to the instance