plz help

Which of the following statements is true about inheritance? a. The property of inheritance anables an entity subtype to inherit the attributes and relationships of the supertype. b. All entity subtypes inherit their primary key attribute from their supertype. c. Entity subtypes inherit all relationahips in which the supertype entity participates: d. Inheciting the relabionships of their supertypes meanr that subtypes cannot have relationships of their own