$5.$ E$/$R Entity Sets saved Which of the following should be multiple entity sets $($instead of multiple attributes on a single entity set$)?$ Each "customer" can have multiple "purchases". An "actor" has a unique "name", but also a non$-$unique "hair$\_$color". "houses" has a one$-$to$-$one relationship with a "mortgage$\_$bank". O "flight" has a "flight$\_$number" and "departure$\_$time" to uniquely determine its values.