One of the disadvantages to a ring network topology is that: O a. The failure of one device (node) will affect the whole network O b. There can be communication delays based on the number of nodes present on the network Oc. Bandwidth is shared between all devices O d. All of the above are disadvantages O e. None of the above are disadvantages are devices that act as "traffic cops" for network traffic. When traffic needs to reach another network, this device determines how the traffic will reach its destination. O a. Switches O b. Modems Oc. Routers O d. Endpoints