Proton nuclear magnetic resonance questions

$^\text{1}$start superscript, start text, 1, end text, end superscriptH and $^\text{13}$start superscript, start text, 13, end text, end superscriptC are two of the most common nuclides studied by high-field NMR spectroscopy due to their abundance in human tissues. Other isotopes that have been studied include $^\text{14}$start superscript, start text, 14, end text, end superscriptN, $^\text{17}$start superscript, start text, 17, end text, end superscriptO, $^\text{31}$start superscript, start text, 31, end text, end superscriptP, $^\text{79}$start superscript, start text, 79, end text, end superscriptBr, and $^\text{127}$start superscript, start text, 127, end text, end superscriptI. Based on this information, which of the following nuclides will NOT be considered suitable for use with NMR spectroscopy?