What do 802.11 stations perform to help avoid collisions on the WLAN medium?

Site A is configured with a WLAN and a policy. The administrator creates a configuration template at the organization level with additional policies for the same WLAN and mentions Site A in this template.
In this scenario, which statement is correct?

What happens first when a client requests to join a WLAN?

Click the Exhibit button.

Referring to the exhibit, which statement is correct?

Mist WLAN objects are configurable at which two levels? (Choose two.)