Which option describes the method used by Cisco IOS gateways to tunnel QSIG signaling messages in H.323 protocol?

Refer to the exhibit.

Which option describes the method used by Cisco IOS gateways to tunnel QSIG signaling
messages in H.323 protocol?

A.
H.323 Annex M1

B.
H.323 Annex M2

C.
H.323 Annex A

D.
ISDN Generic Transparency Descriptor

E.
H.450.1