What is the essential difference between an 'Ethical Hacker' and a 'Cracker'?

What is the essential difference between an ‘Ethical Hacker’ and a ‘Cracker’?

A.
The ethical hacker does not use the same techniques or skills as a cracker.

B.
The ethical hacker does it strictly for financial motives unlike a cracker.

C.
The ethical hacker has authorization from the owner of the target.

D.
The ethical hacker is just a cracker who is getting paid.