Which one of the following statement is true for a layer-4 firewall which is a device that can look at all protocol headers up to the transport layer? (Networking)

• A. It cannot block TCP traffic from a specific user on a multiple-user system during 9.00pm and 5.00pm
• B. It cannot stop incoming traffic from a specific IP address but allow outgoing traffic to the same IP address.
• C. It cannot block entire HTTP traffic during 9.00 pm and 5.00pm
• D. It cannot block all ICMP traffic.