what happens when an endpoint without the HFR codec calls in?

When you are using the HFR codec in a multipoint call that is using version 1.6 or less, what happens when an endpoint without the HFR codec calls in?

A.
The entire call downgrades the data channel to 5 f/s.

B.
The entire call downgrades the data channel to 5 f/s but when the endpoint without the HFR codec drops, ft automatically increases the data channel to 30 f/s

C.
The endpoint without the HFR codec shares data at 5 f/s and all of the other endpoints share data at 30 f/s

D.
The call drops because there are different frame rates.