According to lean manufacturing, a. the product moves from process to process until completion b. finished goods should always be available in case a customer wants something c. employees should be expert at one function rather than be cross-trained for multiple functions d. movement of the product and material is reduced

Option (D)

Explanation:

Lean manufacturing also referred to as lean production is known as the systematic method or technique originally originated in Japanese manufacturing industry, mainly for the purpose of minimization of waste especially in manufacturing system, done without sacrificing any productivity, which can further cause problems.