$81\mathrm{.}5\%$ complete

Question

An IT specialist working for a multinational confectionery company needs to fortify its network security. The firm has been dealing with intrusions where raw User Datagram Protocol $($UDP$)$ messages bypass open ports due to a virus. The specialist will analyze packet data to verify that the application protocol corresponds to the port. The company also wants to track the state of sessions and prevent fraudulent session initiations. Which of the following tools should the IT specialist prioritize deploying?

A$.$Transparent firewall

B$.$Circuit$-$level gateway

C$.$Packet filtering firewall

D$.$Deep packet inspection firewall