Temporary Grafts to a Burn Wound,such as Homografts,heterografts,and Synthetic Skin

Temporary grafts to a burn wound,such as homografts,heterografts,and synthetic skin substitutes,perform which of these functions?

A) prevent water,electrolyte,and protein loss
B) provide for strict rest of the affected area
C) minimize infection of the wound site
D) replace the lost skin so that further grafting is not necessary if granulation tissue is formed