When multiple lens devices are installed in a certain area (exceeding the maximum number of windows supported by the client), and these video sites need to view the live video, which of the following functions can be used to achieve?

When multiple lens devices are installed in a certain area (exceeding the maximum number of windows supported by the client), and these video sites need to view the live video, which of the following functions can be used to achieve?
A . Multiple layouts
B . On the wall
C . Cruise
D . Polling

Answer: D