| List-I | List-II | ||
| (A) | Force acquisition | (I) | Back flip Acquisition |
| (B) | Purchasing company becomes subsidiary of purchased company | (II) | Reverse Acquisition |
| (C) | Private company taking over a public company | (III) | Friendly Acquisition |
| (D) | Cordial acquisition | (IV) | Hostile Acquisition |
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)