How the grid penalties were applied

Where does c reference c?

"c) Once the grid has been established in accordance with Article 42a) and Article 42b), grid position penalties will be applied to the drivers in question. i) The driver with the higher classification from the qualifying practice session will have precedence. d) Once the grid has been established in accordance with Article 42a), 42b) and 42c), grid penalties for any driver required to start the race from the back of the grid after incurring a penalty under Article 28.3 will be applied. i) If more than one (1) driver is required to start the race from the back of the grid they will be arranged in qualifying order. Any driver who incurs a penalty in accordance with Article 28.3 or Article 29 will take precedence over any driver whose qualifying practice times have been deleted for any reason."

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