Which variable will display the client's source IP address when added to an HTML Error Object page?

A Citrix Engineer is reviewing the log files for a sensitive web application and notices that someone accessed the application using the engineer's credentials while the engineer was out of the office for an extended period of time.
Which production can the engineer implement to protect against this vulnerability?

Scenario: A Citrix Engineer is implementing Integrated Caching to increase performance of a web application. The Application Engineer replaces a small logo on the main page with a new one. Later on, when the engineer attempts to access the page, the old logo is displayed. Which enabled setting in the Content Group would cause this to happen?

Scenario: A Citrix Engineer reviews the log files for a business-critical web application. The engineer notices a series of attempts to directly access a file, /etc/passwd.
Which feature can the engineer implement to protect the application against this attack?

Which Citrix Web App Firewall profile setting can a Citrix Engineer configure to provide a response when a violation occurs?