What were the main contributions of the Indian civilization to the evolution of mathematics?

I. The use of a positional and decimal numbering system.
II. The correct use of negative numbers and the introduction of zero.
III. The development of algebraic rules for solving linear and quadratic equations.
IV. The creation of geometric constructions to solve algebraic problems.
a) Only I and II are correct.
b) Only II and III are correct.
c) Only I, II, and III are correct.
d) I, II, III, and IV are correct.