What are the upgrade modes of Huawei Wireless AP? (Multiple Choice)

In the WDS peer-to-peer network, the backbone link between the Root AP and the Leaf AP is connected in the 5 GHz band. The bandwidth used by the Root AP is 149.
Which of the following bands should the Leaf AP use?

What is the area covered by a single AP called?

In TKIP encryption, which bit is the length of IV vector?

According to the AP naming rules, which of the following statement about "AP4030DN" is incorrect?