Refer to the following ERD, which maps courses to prerequisites. Answer questions COURSE CRS ID VARCHAR(8) PK DEPT-CODE VARCHAR(12) FK CRS_DESCRIPTION VARCHAR(64) CRS_CREDIT FLOAT PREREQ CRS_ ID VARCHAR(8) PK FK1 PREREQ-ID VARCHAR(8) PKFK2 tt (TI I F) PREREQ s a weak entity. (T II F)The relationship COURSE:PREREQ is weak. (TII F)All prerequisite courses (crscode) in PREREQ, must link with a valid course in COURSE. (T II F)The foreign key in PREREQ is a composite key (CRS ID, PREREQ ID). (T II F)Upon implementation, table indexes are automatically generated for both tables. What does it mean to say that a database displays both entity integrity and referential integrity? How are each established