Which of the following statement is/are true?

A. Vertical integration is the amount of the production and distribution chain, from suppliers of components to the delivery of Products/Services to customers which is brought under the ownership of a firm

B. Resources flexibility is the case with which equipments and workers can handle a wide variety of products, levels of output, duties and functions

C. Batch processing is used when a moderate volume of goods or services is required and also a moderate variety in products or services

D. All of the above

Answer: Option D