9.2.1 Branch-and-Bound (B\&B) Alqorithm: Hw1 Part1: Repeat the example by choosing 2 as branching variable: A- Show your work of finding the solution by starting Ip2 before Ip3? B- Show your work of finding the solution by starting Ip3 before Ip2? Part2: Research for B\&B in order to reduce the time to find the optimal solution: A- How to select a branching variable )a variable to branch on)? B- Investigate which sub problem to start with