code: def _prepare_load_balancers(self):
          
          stack = {
                  A.NAME: self[A.NAME],
                  A.VERSION: self[A.VERSION],
                  }
  
          for load_balancer in self.get(R.LOAD_BALANCERS, []):
              svars = {A.STACK: stack}
              load_balancer[A.loadbalancer.VARS] = svars
docs: Prepare load balancer variables