Identify all of the following three analytical techniques that could be used to detect the difference between two diastereomers [dye-ah-STARE-ee-oh-murz]: 1) X-ray crystallography [crystal-AW-graphy]; 2) NMR spectroscopy [spek-TRAW-scuh-pee]; 3) Mass spectrometry [spek-TRAW-metry].