Which two of the following must be configured to allow users to blind transfer calls to both internal and PSTN numbers using H.450.2 supplementary service?

Which two of the following must be configured to allow users to blind transfer calls to both internal and PSTN numbers using H.450.2 supplementary service? (Choose two.)

A.
Transfer-system full-blind

B.
Allow-connections h323 to h323

C.
Supplemental Service h.450.2

D.
Transfer-pattern.T