Which two statements about 802.11ac wireless LAN technology are true? (Choose two.)

Which two statements about 802.11ac wireless LAN technology are true? (Choose two.)
A . Antenna design does have to change because 802.11ac occupies different spectrum as 802.11a and 802.11n at 5 GHz
B . The 802.11ac IEEE standard allows for theoretical speeds up to 6.9 Gbps in the 5 GHz band, which is 11,5 times those of 802.11n
C . The 802.11ac standard defines downlink and uplink MU-MIMO, which is for the access point sending to multiple clients concurrently and for multiple clients coordinating to transmit separate packets to the access point at the same time
D . The 802.11ac Wave 2 standard limits itself to communicating with a maximum of four clients at a time, using up to a total of eight spatial streams (for all clients) or a maximum of four spatial streams per client in a MU-MIMO transmission
E . Client MU-MIMO (802.11ac Wave 2) can be achieved easily via software upgrade assuming the client is at least 802.11ac Wave 1 compatible

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Answer: BC