JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://knockoutjs.com/downloads/knockout-3.2.0.js"></script>
<select multiple="multiple" data-bind="options: optionValues,optionsValue: 'Id', optionsText:'name', selectedOptions: multipleSelectedOptionValues"></select>

JavaScript

var viewModel = {
  optionValues: [{name: "name1", Id: 1, fullname: "Development"},{name: "name2", Id: 2, fullname: "Development"},{name: "name3", Id: 3, fullname: "Development"}],

    multipleSelectedOptionValues: ko.observableArray([1,3]),
};

ko.applyBindings(viewModel);