A good night to all.
I've got a quick question on punctuation, in terms of giving emphasis to a word, or phrase. Consider the following:
1) How could you?
2) How could you?!
3) HOW COULD YOU.
Which is correct for a situation where someone would be enraged as they hurl these words? I've seen scripts use #2. If there are other ways you'd show emphasis in the phrase, feel free to share.