Suppose a system uses ACLs to maintain its protection matrix. Write a set of management functions to manage the ACLs when (1) a new object is created; (2) an object is deleted; (3) a new domain is created; (4) a domain is deleted; (5) new access rights (a combination of r, w, x) are granted to a domain to access an object; (6) existing ac- cess rights of a domain to access an object are revoked; (7) new access rights are grant- ed to all domains to access an object; (8) access rights to access an object are revoked from all domains.