Screening router inspects traffic through examining:

A.
message header.

B.
virus payload

C.
message content

D.
attachment type

E.
None of the choices.

Explanation:

The simplest and almost cheapest type of firewall is a packet filter that stops messages with
inappropriate network addresses. It usually consists of a screening router and a set of rules that
accept or reject a message based on information in the message header.