29. Comparing X-ray Crystallography, Circular Dichroism (CD) spectroscopy, Mass spectroscopy and Nuclear Magnetic Resonance (NMR) spectroscopy, choose the incorrect answer:(A) X-ray diffraction data yields electron density map; CD data yields protein secondary structure.(B) Mass spectroscopy could be used in peptide sequencing; NMR could be used to study protein secondary structure.(C) CD data yields protein secondary structure; Mass spectroscopy could be used in peptide sequencing.(D) X-ray diffraction data yields interatomic distances; NMR yields electron density map.(E) Both CD and NMR could be used to study protein secondary structure.