Read the following statements and choose the set of correct statements: (a) Euchromatin is loosely packed chromatin (b) Heterochromatin is transcriptionally active (c) Histone octamer is wrapped by negatively charged DNA in nucleosome (d) Histones are rich in lysine and arginine. (e) A typical nucleosome contains 400 bp of DNA helix. Choose the correct answer from the options given below: