Aura of Silence + Trinisphere

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My opponent controls Trinisphere and Aura of Silence. I want to cast Ornithopter.
It costs:
a) 0 (less than 3) -> 3 -> 3+2 = 5
b) 0 -> 0+2 = 2 (less than 3) -> 3
Trinisphere effect is always applied last when calculataing the total cost. So the right answer is answer b).