2 In a particular deal structure (along with everything else) a trio of sequential VADM (or accretion-directed) classes (VA, VB, & VC) are included for the deal's Z-tranche. (16) 1. Which of the VADMS is most likely to exhibit any instability? (4) 2. What could be the nature of that instability? (4) 3. What is the source of principal for the VADM classes? (4) 4. How does this differ for sequential tranches in the same deal? (4)