18. Identify the following activities as unit level (U), batch level (B), or facility level (F), which would indicate how each activity is incurred relative to production. _______Polishing of watches at a retail store _______Cleaning in the assembly department in a manufacturing environment _______Sampling cookies to determine quality _______Paying real estate taxes on an office building _______Attaching labels to stuffed animals _______Mixing of dough in a local bakery