What is the meaning of the phrase" hit the nail on the head"?

to do something that is exactly right to hit hard to finish a task urgently to fight badly

to do something that is exactly right

The answer is (1) to do something that is exactly right. The other options are incorrect. (2) to hit hard means to use force or violence. (3) to finish a task urgently means to complete a task quickly and without delay. (4) to fight badly means to fight in a clumsy or ineffective way.