Which of the following sequences of statements would ensure that database_admin has the privileges of the roles of administrator and db_role?
a) CREATE ROLE db_role NOINHERIT;
CREATE ROLE administrator NOINHERIT;
GRANT db_role to database_admin;
GRANT db_role to administrator;
b) CREATE ROLE db_role NOINHERIT;
CREATE ROLE administrator NOINHERIT;
GRANT administrator to database_admin;
GRANT db_role to administrator;
c) CREATE ROLE db_role INHERIT;
CREATE ROLE administrator INHERIT;
GRANT administrator to database_admin;
GRANT db_role to administrator;
d) CREATE ROLE db_role NOINHERIT;
CREATE ROLE administrator INHERIT;
GRANT administrator to database_admin;
GRANT db_role to administrator;