Which option allows users to graph historical spreads?

RVM stands for "Relative Value Monitor," which is a tool designed to provide users with the ability to analyze and visualize historical spreads between various instruments in the financial markets. By using RVM, users can create graphs that illustrate the differences in yields or prices over time, helping them to identify trends, assess relative value opportunities, and make informed investment decisions based on historical data.

The other options do not specifically offer the functionality to graph historical spreads as effectively as RVM. YCRV generally relates to yield curve analysis rather than direct spread comparisons, while RVS focuses on relative value strategy assessments but may not provide the detailed graphical analysis as RVM. FWCV is more oriented toward forward curves or quotes in certain markets, which does not align with the objective of analyzing historical spreads. Thus, RVM stands out as the most appropriate choice for graphing historical spreads.