Which of the following statements about localized and delocalized 𝜋 bonding are true?

a. In a localized 𝜋 bond, the two electrons in the bond are associated totally with two atoms.

b. A molecule or ion that has multiple resonance structures with double bonds exhibits delocalized 𝜋 bonding.

c. In a delocalized 𝜋 bond, the electrons are spread among three or more atoms.

d. Benzene is best described using localized 𝜋 bonding.