Which of the following WLAN delivery strategies is wrong?

Which of the following WLAN delivery strategies is wrong?
A . High-density venues: Huawei original factory delivery or original factory supervision delivery (CSP serves as the delivery entity, and Huawei provides engineering survey, planning, and installation training services)
B . Wireless Backhaul: CSP Delivery
C . Massive indoor/outdoor dispersed site scenario: Demonstration sites (at least 5%) are delivered under the supervision of Huawei’s original factory, and the remaining sites are delivered by CSP
D . Campus network: delivered by Huawei original factory/CSP

Answer: B