A developer writes the following code: public with sharing class OrderController() public PaqeReference sendOrder() Order_c order = new Order_c insert order; ExternalOrder externalOrder = new ExternalOrder(order); Http h = new Http(); HttpRequest req = new HttpRequest(); req.setEndpoint('https://www.example.org/v1/orders'); req.setMethod('POST'); req.setBody(JSON.serialize(externalOrder)); HttpResponse res = h.send(req); order = (ExternalOrder)JSON.deserialize(res.getBody(),ExternalOrder.class); While testing the code, the developer receives the following error message: System.CalloutException : You have uncommitted work pending What should the developer do? (Choose two.)