plan (strategy for managing all resources involved in meeting customer demand - efficient delivery, quality products, low cost), source (choose suppliers - relationships with suppliers - host their products on their website and possibly in their warehouses), make (manufacturing - not really relevant), deliver (logistics, coordinating receipt of customer orders, develop a network of warehouses, select carrier to transport, create an invoicing system to receive payments - warehouses in nearly every state - close to big cities for same day or next day shipping, deals with FedEx/UPS/USPS and starting their own shipping division with their own trucks), and return (handling defective, returned, or excess products from customers - make it easy to return products)

B

A

A, B, C, D