What is the purpose of the Sinha method described in the text?

I - To determine the activity of catalase.
II - To measure the concentration of dicromate in acetic acid.
III - To estimate the amount of hydrogen peroxide in a sample.
IV - To identify the presence of acetate chromic in a solution.
a) Only I and II are correct.
b) Only I and III are correct.
c) Only I and IV are correct.
d) Only II and III are correct.
e) Only III and IV are correct.