Explanation:

The tool that would help UC understand the existing functionality of all of its reporting tools is a capability model. A capability model is a visual representation of the core capabilities or functions that an organization performs or delivers to achieve its strategic objectives. A capability model helps to identify and organize high-level process areas that span across different departments or teams, as well as highlight any gaps or overlaps in functionality. A capability model can also help to prioritize and scope Salesforce projects based on business value and impact. In this case, UC can use a capability model to map out all of its reporting tools by their capabilities or functions, such as data sources, data integration, data analysis, data visualization, data sharing, etc. This would help UC understand what each reporting tool can do or provide, how they relate or differ from each other, and where there may be redundancies or inefficiencies in their reporting processes.