what troubleshooting steps should you perform?

Examine the error:
GSM-45054: GSM error or NET-40006: unable to start GSH
What is the cause of this error, and what troubleshooting steps should you perform?

A.
The GDS catalog database of its listener may be down. Verify that the GDS catalog database
and its local listener are running.

B.
The GDS pool database may be down. Make sure that the GDS pool databases are up and the
service is enabled and started.

C.
The GDS pool database’s local listener may be down. Make sure that it is running.

D.
The global service may be down. Verify that the pool databases are up and the service is
started.

E.
The global service may be disabled. Make sure that the pool databases are up and the service
is enabled and started.