Which mode must be set for APs to communicate to a Wireless LAN Controller using the Control and Provisioning of Wireless Access Points (CAPWAP) protocol?

Refer to the exhibit. An engineer must add a subnet for a new office that will add 20 users to the network. Which IPv4 network and subnet mask combination does the engineer assign to minimize wasting addresses?
Drag and drop to the characteristics of networking from the left onto the correct networking types on the right.

When a switch receives a frame for a known destination MAC address, how is the frame handed?