What qualifies a person as trans, to you?

If you're transphobic or don't believe being trans is possible, then this question isn't for you.

For everyone else, do you have something that qualifies a person as trans? Do they have to put in a certain amount of effort into looking like the opposite sex in order to "count" in your eyes? Do they have to change the way they act or talk? Do they have to do surgeries to remove their reproductive organs? Something else?
What qualifies a person as trans, to you?
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