What CRS Server configuration enabled the CRS Server to fail over to a secondary Call Manager when the primary Call Manager fails?

A.
The LDAP Directory must have a secondary profile configured

B.
No special configuration is required. Call Manager maintains the failover.

C.
There must be a second JTAPI user configured with an alternative range of CTI ports.

D.
the CRS Server’s JTAPI Provider must be configured with secondary Call Manager’s IP address following the primaries.

Explanation: