Final answer:
The staff nurse calmly repeating, 'I worked last Christmas and will not work this Christmas,' is an example of the assertive behavior technique of standing up for one's basic rights.
Step-by-step explanation:
The staff nurse calmly repeating, 'I worked last Christmas and will not work this Christmas,' is an example of the assertive behavior technique of standing up for one's basic rights. By asserting their right to not work on Christmas, the staff nurse is setting boundaries and advocating for themselves.