[WIFI] What dose DBDC and MBMC stands for?

I’ve seen DBDC and MBMC in the feature list. What dose it means?

I’ve found it on another forum.

Difference between DBDC and MBMC: MBMC is an upgraded version of DBDC, supporting three bands—2.4 GHz, 5 GHz, and 6 GHz—whereas DBDC only supports 2.4 GHz and 5 GHz. If the system shows MBMC Mode: Enable but only uses 2.4G + 5G, it can still be regarded as a pass for DBDC.