If two players call "Muggins" at the same time (in a three-player Cribbage game), and both players call the correct number of points, which player is awarded the points?

I have looked at several sources but found nothing ([ACC](http://www.cribbage.org/rules/), Pagat.com, [The House of Cards](http://www.thehouseofcards.com/rules/cribbage-rules.html) and more).

In the meantime, my friends and I have made a list of 3 possible solutions and we are "evaluating" them:

1. Both players are awarded the points;
2. Each player is awarded only half the points (rounding to the upper value);
3. The player to the left (from the underpegging player) is awarded the points.