Which of the following spatial stream combinations are supported by Huawei AirEngine 6760 series after...

Huawei AirEngine 6760 series supports four spatial streams by default, but after an RTU (Right To Use) license is purchased, it can support up to eight spatial streams on the 5 GHz band. It can also support four spatial streams on the 2.4 GHz band or scanning mode. Therefore, the possible spatial stream combinations are 4+8, 4+8+4, 4+4+scanning, and 4+6+scanning.