Pick out the incorrect statement
a) MnO2 dissolves in dilute HCl but does not form Mn4+
b) MnO2 oxidises hot conc. H2SO4 liberating oxygen
c) K2 MnO4 is formed when MnO2 is fused with KOH in presence of KNO3
d) Decomposition of KMnO4 is not catalyzed by sunlight.