Pancreatic necrosis

Q) Pancreatic necrosis all are true except
a) Sterile pancreatic necrosis may be managed conservatively in most of the cases
b) Infected Pancreatic Necrosis  is managed by surgery at 2 weeks
c) Minimal access techniques have given better results than open necrosectomy
d)WOPN may be drained by either a transgastric or, less commonly, a transdoudenal route.