Explanation
An XML firewall is most commonly deployed in line between the firewall and application server to validate XML code before it reaches the application. An XML firewall is intended to validate XML before it reaches the application. Placing the XML firewall between the presentation and application layers, between the firewall and IPS, or between the application and data layers would not serve the intended purpose.

Explanation
Auditing, which can be supported to varying degrees by DLP solutions, is not a core component of them. Data loss prevention (DLP) solutions have core components of discovery and classification, enforcement, and monitoring. Discovery and classification are concerned with determining which data should be applied to the DLP policies, and then determining its classification level. Monitoring is concerned with the actual watching of data and how it's used through its various stages. Enforcement is the actual application of policies determined from the discovery stage and then triggered during the monitoring stage.

Explanation/Reference:
Explanation:
The store phase occurs immediately after the create phase, and as data is committed to storage structures, the first opportunity for security controls to be implemented is realized. During the create phase, the data is not yet part of a system where security controls can be applied, and although the use and share phases also entail the application of security controls, they are not the first phase where the process occurs.