收回exam1用户和exam2用户的所有权限，下列命令正确的是（ ）

A、REVOKE ALL PRIVILEGES,GRANT OPTION FROM‘exam1‘, ‘exam2‘
B、REVOKE ALL PRIVILEGES,GRANT OPTION FROM‘exam1‘@‘localhost‘, ‘exam2‘@‘localhost‘
C、REVOKE ALL PRIVILEGES,GRANT OPTION FROM‘exam1localhost‘, ‘exam2localhost‘
D、REVOKE PRIVILEGES,GRANT OPTION FROM‘exam1‘@‘localhost‘, ‘exam2‘@‘localhost‘