Priority, junctions & roundabouts

On a lit roundabout near Workum (sign B6 + shark's-teeth present) you notice just before your exit that you are about to take the wrong one. What is correct?

I briefly turn left-handed back to the previous exit, since there's no one around
I have priority over all traffic on the roundabout, since I've been on it longer than they have
I keep driving rechtsom, an extra lap if needed, until the correct exit
I stop in the middle of the roundabout until the next exit is clear

Explanation

False — 'Being on it longer' is not a rule — with sign B6 the rule is simply: traffic on the roundabout has priority over entering traffic, nothing more (Book p.82).

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