def construct_bap_id(subscription_id, group_name, lb_name, address_pool_name):
    """Build the future BackEndId based on components name.
    """
    return ('/subscriptions/{}'
            '/resourceGroups/{}'
            '/providers/Microsoft.Network'
            '/loadBalancers/{}'
            '/backendAddressPools/{}').format(
                subscription_id, group_name, lb_name, address_pool_name
            )