When switching from a traditional costing system to an activity- based costing system that contains some batch-level costs: Select one: O a. the unit product costs of high volume products typically increase and the unit product costs of low volume products typically decrease. O b. the unit product costs of high volume products typically decrease and the unit product costs of low volume products typically increase. O c. the unit product costs of both high and low volume products typically increase Od. None of the given answer e. the unit product costs of both high and low volume products typically decrease