"Choices Source" Expression to constrain based on a composite-list-field, "OR" condition

So i have a Multi-dropdown with Dynamic Choices, Type of Choice: User.

One of the fields i have for User is: User Department, which is a field associated to another Type called: “Departments”, and its also a “List” field since a user can be working in multiple departments.

I want to Constrain the "Choices Source" to Users that are associated to Department B OR C only.

Can’t seem to get the expression right.

Anybody?

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