Deductions & credits

If a W-2 employee provides in-home services to a half dozen clients each day but occasionally goes to the corporate office nearby her house, which is true?

1) *All* of the miles driven to and from client residences are deductible, those driven to the office are not.

2) The deduction is the total miles driven in a given day, minus one imputed office RT each day, regardless of whether the office is on that day's itinerary.

3) Deductible miles vary day to day, based on eliminating the first and last leg for that day.

4) Something else.