Which of the following statements best describe middlebox devices? a. Middlebox device act as network hubs that forward data to multiple devices. b.Middlebox devices operate only in the network layer....

Which of the following statements best describe middlebox devices?
a. Middlebox device act as network hubs that forward data to multiple devices.
b.Middlebox devices operate only in the network layer.
c.Middlebox devices are routers that process, modify, and forward IP packets
d.A firewall is a type of middlebox device.