ENTITYA A H ENTITY B Given only the excerpt of an E-R model shown above, which of the following is known to be true? ENTITY B is a weak entity. A single instance of ENTITY B may be related to many instances of ENTITY A. A single instance of ENTITY A must be related to one instance of ENTITY B. ENTITY B has a degree of many. Both A single instance of ENTITY A must be related to one instance of ENTITY B and ENTITY B has a degree of many are true