H85 (Fail): Using OPTGROUP to group OPTION elements inside a SELECT

HTML Snippet Code
Scenario 1: Option group is not used for the options
<label for="options">Select your favorite car</label><select class="selectpicker" id="options"> <option class="label" disabled="disabled">Sports cars</option> <option value="ferrari" class="val">Ferrari</option> <option value="lamborghini" class="val">Lamborghini</option> <option class="label" disabled="disabled">Luxury cars</option> <option value="mercedes" class="val">Mercedes</option> <option value="bentley" class="val">Bentley</option> </select>