Each of the following is a potential activity driver. Identify the most likely level of each driver

Question:

Each of the following is a potential activity driver. Identify the most likely level of each driver with U for a unit-level driver, B for a batch-level driver, and P for a product-level driver.
(a) Pounds of materials used
(b) Work orders
(c) Direct labor hours
(d) Total value added
(e) Units produced
(f) Machine setups
(g) Design changes
(h) Marketing promotions