Which two statements are true about configuring fail-over? (Choose two.)

A.
A static port can be configured in Configltnm.cfg file.

B.
A static port can be configured in ServiceData.cfg file.

C.
Ctrl Services is the preferred method for configuring fail-over.

D.
The Configltnm.cfg files must be identical on both primary and backup.

E.
Only ncp_model, ncp_poller and ncp_disco can be configured to fail-over