Refer to the exhibit.

An engineer configured CCD between a Cisco Unified Communications Manager (CUCM) cluster and Cisco Unified Communications Manager Express (CME). When the CUCM agents try to dial a CME extension on the range 7XXX, they receive a busy signal as soon as the 7 is dialed. What can be done to resolve this issue?

A.	Set the CUCM CCD Requesting Service PSTN prefix to 9 instead of+
B.	Set the CME profile dn-block type to extension instead of global
C.	Set the CUCM Hosted DN Pattern PSTN Failover Strip Digits field to 1 instead of 0
D.	Set the CME subscribe callcontrol to instance instead of wildcarded