The sequencing of activities is often based upon dependencies between the activities. the dependencies that should guide activity sequencing can be either:
a. mandatory or discretionary
b. arbitrary or capricious
c. logical or illogical
d. interior or exterior

a.mandatory or discretionary

Explanation:

Based on the information provided within the question it can be said that these dependencies can either be mandatory or discretionary. Mandatory meaning that these dependencies are placed in a way where they must happen, while discretionary dependencies are based on something that should be done. Either of which should guide activity sequencing.

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