The type of isomerism possible with the molecular formula, C4H11NA) Chain isomerismB) Positional isomerismC) Functional isomerismD) Metamerism

I) 1CH3CH2CH2CH2NH2 2CH3CH2CH(CH3)NH23CH32CHCH2NH2 4CH33CNH2II) 5C2H5−NH−C2H5 6CH3−NH−CH2CH2CH3 7CH3−NH−CHCH32III) 8CH32N−C2H5I, II, III are functional isomers;5 & 6 are metamers5 & 7 are metamers1 & 2 are positional isomers1 & 3 are chain isomers