What is the proper responce to the question " Hello, how are you?"?

Question

What is the proper responce to the question " Hello, how are you?"?

Answer 1

I proceed to tell them everything that is wrong with my life.  

Answer 2

"Hello, I am fine thanks! And you?"

Answer 3

"I am well, thank you.  How are you?"

An alternate reciprocation would be, "and yourself?"  But this raises the issue of where the new sentence begins, because the word 'and' should not appear at the beginning of a sentence.

Answer 4

If you are doing fine then the best answer is

"I am doing well, thank you."

It's grammatically wrong to say the following: " I am doing good."

"Good" is not a state of being.  

Answer 5

Fine, thanks. And you?

Answer 6

I'm good, and you?

Answer 7

None of your d**n business?  LOL

Answer 8

I am very well, thank you.