Change the order of integration for the given double integral:
∫(from 0 to 1) ∫(from -1 to √y) 6y² dx dy
a) ∫(from -1 to 0) ∫(from 0 to y²) 6y² dy dx b) ∫(from -√y to 1) ∫(from -1 to 0) 6y² dx dy c) ∫(from 0 to 1) ∫(from 0 to 6y²) dx dy d) ∫(from 1 to 0) ∫(from -√y to 1) 6y² dy dx