It is less complicated than it looks, once the terms are clear.
Ask around and you will get a different answer every time, so here is the short version.
What actually changed
There is a deadline involved, and missing it costs more than the difference. The exceptions matter more than the rule, and there are three of them.
What to check first
There is a deadline involved, and missing it costs more than the difference. Most of the confusion comes from two terms that sound alike and mean different things.
None of this is urgent, but it is worth an hour before the next renewal.
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