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