What is the purpose of the NCh19.Of79 standard?

I- To establish a common system to help identify fluids transported in piping systems.
II- To provide greater safety and reduce the causes of error, confusion or inoperability in emergency situations.
III- To cover the identification of materials contained in buried pipes or electrical conductors.
IV- To replace the NCh19.0f61 standard.
a) Only I and II are correct.
b) Only II and IV are correct.
c) Only I, II and IV are correct.
d) Only III is incorrect.
e) All statements are correct.