Provide default options for exposed filters.
function build_group_options() {
$this->options['group_info'] = array(
'label' => $this->definition['title'],
'description' => NULL,
'identifier' => $this->options['id'],
'optional' => TRUE,
'widget' => 'select',
'multiple' => FALSE,
'remember' => FALSE,
'default_group' => 'All',
'default_group_multiple' => array(),
'group_items' => array(),
);
}