Answer:
Amethyst Inc. most likely uses Customer departmentalization
Step-by-step explanation:
Departmentalization is the process which involves grouping various activities into different departments.
Customer departmentalization is a type of departmentalization which involves grouping activities into departments on the basis of the types of customers, by assuming that the customers in each department have common needs that can be met and issues that can be resolved by the specialists.
Therefore, Amethyst Inc. most likely uses Customer departmentalization.