Section: INFORMATION RISK MANAGEMENT
Explanation:
The total cost of ownership (TCO) would be the most relevant piece of information in that it would establish a cost baseline and it must be considered for the full life cycle of the control. Annual loss expectancy (ALE) and the frequency of incidents could help measure the benefit, but would have more of an indirect relationship as not all incidents may be mitigated by implementing a two-factor authentication system. The approved budget for the project may have no bearing on what the project may actually cost.

Explanation
A risk register is more than a simple list - it should lie used as a tool to ensure comprehensive documentation, periodic review and formal update of all risk elements in the enterprise's IT and related organization. Identifying risks and assigning roles and responsibilities for mitigation are elements of the register. Identifying threats and probabilities are two elements that are defined in the risk matrix, as differentiated from the broader scope of content in, and purpose for, the risk register. While the annualized loss expectancy (ALE) should be included in the register, this quantification is only a single element in the overall risk analysis program.