Per Rule #2, MMB is the default condition referenced by a size datum feature.

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Quizplus · Accepted Answer

Rule #2, also known as the principle of independency, does not specify MMB (Maximum Material Boundary) as the default condition for a size datum feature. It states that size dimensions must be met independently of geometric tolerances. MMB is a concept related to geometric dimensioning and tolerancing that applies when features are at their maximum material condition.

Per Rule #2, MMB Is the Default Condition Referenced by a Size