You want to start the managed server calledmanaged1 in “Standby” mode, to keep it as a
“hot backup”.
A.
There is no such thing as “standby” mode.
B.
The server managed1 must be of a cluster.
C.
Your domain has an administration port.
D.
Only the admin server can start in “standby” mode.
c
http://docs.oracle.com/cd/E21764_01/apirefs.1111/e13952/taskhelp/startstop/StartManagedServersInSTANDBY.html
C is the correct one
https://docs.oracle.com/cd/E50629_01/wls/WLACH/taskhelp/startstop/StartManagedServersInSTANDBY.html