What is the purpose of the NCh773/4.Of92 standard?

I- To establish a method of testing the impact resistance of safety toe caps.
II- To establish the requirements for safety footwear manufacturing.
III- To establish the requirements for the reception of safety toe caps.
IV- To establish the requirements for the reception of safety footwear.
a) Only I and II are correct.
b) Only I and III are correct.
c) Only II and IV are correct.
d) Only I, II and III are correct.
e) All statements are correct.