servicenow query business rule to filter out all inactive users

function onBefore(current, previous) {
    //Type appropriate comment here, and begin script below
    var gr = new GlideRecord('sys_user');
    gr.addQuery('active', false);
    gr.addQuery('department', '!=', 'Service Desk');
    gr.query();
    while(gr.next()) {
      current.removeOption(gr.sys_id.toString());
    }
}