An adult old man gets a burn injury to his hands

An adult old man gets a burn injury to his hands. Over few weeks, the burned skin heals without the need for skin grafting. The most critical factor responsible for the rapid healing in this case is 

1. Remnant skin appendages.


2. Underlying connective tissue.


3. Minimal edema and erythema.


4. Granulation tissue.


Ans 4