When using rule 1 A feature must have perfect form when a at

When using rule #1 A feature must have perfect form when

a) at its RFS

b) at its LMC

c) at its mmc

d) at its nominal size

The simplest meaning of rule #1 is at MMC the feature is on perfect form.

Rule #1 is often paraphrased as \"Perfect form at MMC\"

Therefore option \'c\' is correct