Final answer:
Sue Ann is on a Temporary Assignment in New York since she is assigned there for only three months during her firm's busy season, after which she is expected to return to her home office in Dallas.
Step-by-step explanation:
Based on the scenario provided, Sue Ann is on a Temporary Assignment in New York because her assignment is for a duration of three months during the busy season of her firm. Temporary assignments typically refer to work assignments in a location different from one's usual place of work, for a limited period.
As her primary residence and office are in Dallas, and she has been in New York for just three months, this situation falls under the common definition of a temporary duty assignment, assuming that after the three-month period, Sue Ann is expected to return to her regular work location in Dallas.