When a call between two HQ users was being conferenced with a remote user at the BR site, the conference failed. Which configuration would be needed to solve the problem?

Refer to the exhibit.

When a call between two HQ users was being conferenced with a remote user at the BR site, the conference failed. Which configuration would be needed to solve the problem?
A . The BR_MRG must contain the transcoder device. The BR_MRGL must be assigned to the BR phones.
B . The HQ_MRG must contain the transcoder device. The HQ_MRGL must be assigned to the HQ phones.
C . A transcoder should be configured at the remote site and assigned to all remote phones through the BR_MRG
E . The HQ_MRG must contain the transcoder device. The HQ_MRGL must be assigned to the software conference bridge.
F . Enable the software conference bridge to support
G . 711 and
H . 729 codecs in Cisco Unified Communications Manager service parameters.

Answer: D