Number of anti-aromatic compound in the following compound is _____.

The molecules, which have 4nπ electrons are anti-aromatic compoundsa) has 4π-electrons(b) has 6 + 2 (from oxygen atom) - 8π electrons(c) has 6π-electrons and one C-atom is sp3 hybridised hence it is non - aromatic(d) is aromatic(e) has 4π-electrons as available lone pair with N - atom will not be delocalized in this conjugated system.(f) has 12π-electrons. Hence, (a), (b), (e) and (f) are anti-aromatic.