What is usually considered "good practice" in how airlines handle and manage business ideas? Group of answer choices A. Customers should be given the opportunity to contribute new business ideas. B. A good business case only focuses on only one objective, not slowing down the processing and analysis of the business idea. C. Business ideas can relate either to the existing business or to adding new products, services, and processes for the airline. D. Business ideas, initially, should come mainly from middle and upper management to minimize any unpleasant roadblocks from various staff unions. E. A and C F. A, B, and C