Some properties of the two species NO₃⁻ and H₃O⁺ are described below. Which one of them is correct?
a) NO₃⁻ is a stronger acid than H₃O⁺
b) H₃O⁺ is a stronger base than NO₃⁻
c) Both N₃⁻ and H₃O⁺ are Lewis acids
d) Both NO₃⁻ and H₃O⁺ are Lewis bases