To solve this question, the user needs to understand what Threat Modeling is and what tools can be used for it.

Threat Modeling is a process of identifying potential security threats and vulnerabilities in an application or system. It helps to find security weaknesses early in the development cycle, reducing the risk of costly security breaches in the future.

Now, let's go through each option and explain why it is right or wrong:

A. HP Web Inspect: HP Web Inspect is a web application security scanner that can help identify vulnerabilities in web applications. However, it is not a tool that is typically used for threat modeling.

B. Nessus: Nessus is a popular vulnerability scanner that can help detect and report potential security issues. While it can be used as part of a threat modeling process, it is not specifically designed for threat modeling.

C. Open Vas: OpenVAS is an open-source vulnerability scanner that can help identify vulnerabilities in networks and systems. While it can be used as part of a threat modeling process, it is not specifically designed for threat modeling.

D. TAM: TAM (Threat Agent Modeling) is a structured approach to identifying potential threats to a system or application. It is a tool that can be used for threat modeling, as it helps identify and prioritize potential threats based on the likelihood and impact of each threat.

Therefore, the correct answer is: D. TAM