Attempting to start the observer raises an error
DGMGRL> start observer:
DGM-16954 Unable to open and lock the Observer configuration file Faile
D.
Identify two possible ways to start the observer successfully
start the observer in a different working directory.
A.
Set the Observer Override property to TRUE before starting the observer
B.
Create a broker configuration and enable Fast-Start Failover before starting the observer
C.
Start the observer using a different observer configuration file.
D.
Identify two possible ways to start the observer successfully
start the observer in a different working directory.
E.
Enable Fast-Start Failover before starting the observer
Only one observer can be observing the broker configuration at any given time. If you attempt to start a second observer, one of the following errors is returned:
ORA-16647: could not start more than one observer
DGM-16954: Unable to open and lock the Observer configuration file
C.
Start the observer using a different observer configuration file.
D.
Identify two possible ways to start the observer successfully
start the observer in a different working directory.
is correct, see also question 38
C and D are correct