Which statement is TRUE regarding network firewalls preventing Web Application attacks?

Network layer firewalls, also called packet filters, operate at a relatively low level of the TCP/IP protocol stack, not allowing packets to pass through the firewall unless they match the established rule set. To prevent Web Application attacks an Application layer firewall would be required.

References: https://en.wikipedia.org/wiki/Firewall_(computing)#Network_layer_or_packet_filters