Explanation
This expression matches the host name 'www.example.com' in all HTTP requests by using the EQ operator, which performs a case-sensitive string comparison. The other options are incorrect because they either use the wrong message type (HTTP.RES instead of HTTP.REQ), the wrong method (HOSTNAME instead of HOSTNAME.EQ), or the wrong operator (CONTAINS instead of EQ). For more information, see HTTP expressions and Operators in the Citrix documentation.