I would like to identify the correct code for the button highlighted in yellow, please could someone help me figure out. I am new to Selenium

[![enter image description here][1]][1]

[1]

<div id="InVivoVitroWorkcheckboxDiv" class="btn-group" data-toggle="buttons">
  <div class="btn btn-default"> <input class="vivovitrocls" type="checkbox" name="SelectedInVivoVitroWork" value="In Vivo Animals"> In Vivo Animals<span class="glyphicon glyphicon-ok"></span></div>
  <div class="btn btn-default"> <input class="vivovitrocls" type="checkbox" name="SelectedInVivoVitroWork" value="In Vivo Humans"> In Vivo Humans<span class="glyphicon glyphicon-ok"></span></div>
  <div class="btn btn-default"> <input class="vivovitrocls" type="checkbox" name="SelectedInVivoVitroWork" value="In Vitro Work"> In Vitro Work<span class="glyphicon glyphicon-ok"></span></div>
  <div class="btn btn-default"> <input class="vivovitrocls" type="checkbox" name="SelectedInVivoVitroWork" value="NA"> N/A<span class="glyphicon glyphicon-ok"></span></div>
</div>

: https://i.stack.imgur.com/i3Q0A.jpg