The sequencing of activities is often based upon dependencies between the activities. the dependencies that should guide activity sequencing can be either:

a. critical or non-critical
b. opportunities or threats
c. mandatory or discretionary
d/ interior or exterior

C

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

answer; /// the correct answer is (10) days; /// good luck

the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy