What is the default for all geometric controls according to Rule #2?

In the context of Geometric Dimensioning and Tolerancing (GD&T), Rule #2 refers to the default condition that applies to most geometric controls unless specified otherwise. The correct answer is RFS (Regardless of Feature Size). This means that the geometric tolerance is applied without considering the size of the feature, allowing for maximum variability in the position, orientation, or form of the feature being controlled.

RFS serves as the baseline condition for geometric controls, ensuring that the tolerance zone is maintained regardless of whether the feature is at its maximum material condition (MMC) or at its minimum material condition (LMC). This is crucial for ensuring consistent assembly and function of parts, as it provides a clear framework for how deviations from the ideal geometry will be accepted.

The other choices represent concepts related to GD&T but do not serve as the default condition for geometric controls as defined by Rule #2. For instance, MMC relates to the condition of a feature when it contains the maximum amount of material, which calls for different considerations in tolerancing. Understanding RFS as the default condition helps reinforce the importance of managing tolerances effectively for proper part function and fit.