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Given the following UML, which of the following statements must be true? Class Dlagram ToP CoPder PPOcessinE Sste Ordcr CustomerlD Int CustomerName: String Address : String Phone: In Orderld:In Customerld: Int CustomerName: String Productld: Int mount: Float OrderDale Datetime 0..1 + Edi OrderInt Orderld) Product Stock Productld: Int Quatity: In ShopNo: Int Productld: Int ProductPrice Floal ProductType: String Mod ySlockInt Productld) +Selectstockltem(int Producild) +SelectProducInt Productid) The Order class is an interface or abstract class. There is an aggregation relationship between Order and Product. There is an aggregation relationship between Stock and Product. n There is an unidirectional relationship between Order and Customer. There is a bidirectional relationship between Order and Customer n There is a generalization relationship between Order and Product n There is no relationship between Customer and Stock