Identify each of the following activities as unit level (U), batch level (B), product level (P), or facility level (F) to indicate the way each is incurred with respect to production. 1. Paying real estate taxes on the factory building. 2. Attaching labels to collars of shirts. 3. Redesigning a bicycle seat in response to customer feedback 4 Cleaning the assembly department. 5. Polishing of gold wedding rings. 6. Mixing of bread dough in a commercial bakery. 7. Sampling cookies to determine quality