A mail relay should normally be placed within a demilitarized zone (DMZ) to shield the internal network. An authentication server, due to its sensitivity, should always be placed on the internal network, never on a DMZ that is subject to compromise. Both routers and firewalls may bridge a DMZ to another network, but do not technically reside within the DMZ, network segment.

Section: INFORMATION SECURITY PROGRAM DEVELOPMENT
Explanation:
If keys are in the wrong hands, documents will be able to be read regardless of where they are on the network.
Choice A is incorrect because firewalls can be perfectly configured, but if the keys make it to the other side, they will not prevent the document from being decrypted. Choice B is incorrect because even easy encryption algorithms require adequate resources to break, whereas encryption keys can be easily used. Choice C is incorrect because the application "front door" controls may be bypassed by accessing data directly.

Explanation/Reference:
Explanation:
Recovery criteria, indicating the circumstances under which specific actions are undertaken, should be contained within a business continuity policy. Telephone trees, business impact assessments (BIAs) and listings of critical backup files are too detailed to include in a policy document.

Explanation/Reference:
Explanation:
Risk should be addressed as early as possible in the development cycle. The feasibility study should include risk assessment so that the cost of controls can be estimated before the project proceeds. Risk should also be considered in the specification phase where the controls are designed, but this would still be based on the assessment carried out in the feasibility study. Assessment would not be relevant in choice A or C.