Which Is True for Mass Spectrometry of Proteins

Which is true for mass spectrometry of proteins?
I MALDI and electrospray are major methods for introducing proteins into the gas phase.
II The equation is used to determine the number of H⁺ bound to a protein from the mass spectrum.
III Once n is known;the molecular mass of the protein is calculated,molecular mass = nm_n.
IV Electron-transfer dissociation is a mass spectrometry technique to sequence proteins.

A) I,II,and IV
B) II and IV
C) III and IV
D) I,III,and IV
E) II and III

Correct Answer:

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