Switches are pretty easy to configure when using the following:a.POP3 protocolb.CSMA/CD rulec.Hub topologyd.Tree session

The statement seems to be a bit confusing as it mixes different concepts from networking. Let's break it down:

a. POP3 protocol: This is a protocol used by local email clients to retrieve emails from a remote server. It doesn't have anything to do with configuring switches.

b. CSMA/CD rule: This stands for Carrier Sense Multiple Access with Collision Detection. It's a network protocol for carrier transmission used in Ethernet networks. While it is used to manage data transmission to avoid data collision, it's not directly related to the configuration of switches.

c. Hub topology: This refers to a type of network setup where each device is connected to a single, central hub. This is an older technology and has largely been replaced by switches and routers. Configuring a switch in a hub topology would be the same as in any other topology.

d. Tree session: This term is not standard in networking. It might be referring to a tree topology, which is a type of network configuration that is hierarchical in nature. Again, configuring a switch would be the same process regardless of the topology.

In conclusion, none of the options provided directly relate to the ease of configuring switches. Switches are configured based on their own settings and requirements, not based on the protocol, rule, topology, or session they are used in.