According to lean manufacturing,

A) finished goods should always be available in case a customer wants something
B) employees should be expert at one function rather than be cross-trained for multiple functions
C) movement of the product and material is reduced
D) the product moves from process to process until completion

Lean manufacturing aims to reduce waste and increase efficiency by minimizing the movement of products and materials. By minimizing movement, time and cost are saved, and the potential for errors or damage during transportation is reduced. Option A is incorrect because keeping a large inventory of finished goods is considered wasteful in lean manufacturing. Option B is incorrect because cross-training employees allows for more flexibility and adaptability in the production process. Option D is incorrect because in lean manufacturing, products move through processes only when necessary, with the goal of reducing idle time and waiting.