The key is unlocked, and the lock is the problem. The key that can open the lock is a useful key, and the management that can solve the problem is the effective management. There are all kinds of locks, and there are all kinds of keys. Trying to open a million locks with one key, It can only be ideal, not reality. Although the principle of the key is universal, whether it is really effective and useful is all about "the beauty of using it, and it is in the heart. " There is a division of labor, a division of labor is not a division of family, and authorization is not a loss. Authorization must have a "remote control". The remote control must choose the person who controls it, grasp the main contradictions and the leading aspects of the contradiction, one control the "head", that is, to control the thought and behavior; the other control the "foot", that is, to control the resource funds . This is the key: it is easy to use and not complicated. What is the most appropriate summary of this text? ['Management should be the key and the key should work.', 'Management should be the key, and the key should be concise.', 'Constantly verify the pragmatic availability of keys during unlocking.', 'Recognize the laws of things, grasp the pulse of the times, and drive the "key" development.']