When using HFR codec in a multipoint call, what happens when an endpoint without HFR calls in?

A.
The entire call downgrades the data channel to 5 fps.

B.
The entire call downgrades the data channel to 5 fps but when the endpoint without HFR codec drops, it automatically increases the data channel to 30 fps.

C.
The endpoint without the HFR shares data at 5 fps and all the other endpoints share at 30 fps.

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