Consider the following pairs:
- List I (Mechanism/Event) - List II (Fact)
- A. Special Representatives (SR) mechanism - 1. Established in 2003
- B. Political Parameters and Guiding Principles Agreement - 2. Signed in 2005; envisages a three-stage boundary settlement process
- C. Galwan Valley clash - 3. Occurred in 2020; first combat fatalities on the India-China border in over four decades
- D. Expert-Level Mechanism on Trans-border Rivers - 4. Facilitates hydrological data-sharing between India and China
How many of the above pairs are correctly matched?