Intra Abdominal pressure

Q) Which of the following is not true about Intra abdominal pressure (IAP) 

a) Normal Intra abdominal pressure in most people is less than 5 mmHg

b) After non complicated surgery  IAP remains less than 5mm Hg

c) IAH (Intra abdominal hypertension) is IAP more than 12 mmHG

d) ACS is IAP more than 20 mm Hg

Question on Management of Abdominal Compartment Syndrome