What does Goldratt's Critical Chain explain?

Select one:a. Theory of Constraints for better management of scope and development of more realistic work breakdown structureb. The principal foundation on the critical path method which is the longest path from start to finish, it indicates the maximum time required to complete the project.c. All of the options listedd. The Theory of Constraints for better management of schedules through fixing of bottlenecks in order to improve the throughput of overall system. This was the foundation to Critical Chain Project Management Method.e. The principal foundation on the critical path method which is the longest path from start to finish, it indicates the minimum time required to complete the project.