Answer:
C
Step-by-step explanation:
Mandatory or discretiinary
A mandatory dependency is one that must happen at a particular time. It is usually requirement of some kind based on contracts, laws, company procedures, physical limitations, etc. When the sequence of events is developed for various aspects of the process, mandatory dependencies are placed where they must happen.
A discretionary dependency is one that isn't based on a must, but on a should. These decisions are usually based upon best practices, business knowledge, preferences etc.When the sequence of events is developed they are placed where the team members would like them to occur