jQuery ajax data.d未定义

I am trying to get CRM data using the Ajax call. Data is being returned with 'd' and 'result' properties but I can't get it on client side. It says ajaxdata.d is undefined.

A sample Ajax call:

var context = Xrm.Page.context;
var serverUrl = context.getClientUrl();
var ODATA_ENDPOINT = context.prependOrgName("/xRMServices/2011/OrganizationData.svc");

var filter = "?&$select=cc_TypeID,cc_customentityId,cc_anotherAttribute&$filter=cc_TypeID eq '2'";

var odataUri = ODATA_ENDPOINT + "/cc_customentitySet" + filter;

console.log("odataUri: " + odataUri);

//Asynchronous AJAX function to Retrieve a CRM record using OData
$.ajax({
    type: "GET",
    contentType: "application/json; charset=utf-8",
    datatype: "json",
    url: odataUri,
    async: false,
    beforeSend: function (XMLHttpRequest) {
        //Specifying this header ensures that the results will be returned as JSON.            
        XMLHttpRequest.setRequestHeader("Accept", "application/json");
    },
    success: function (ajaxdata, textStatus, XmlHttpRequest) {
        //console.log("cc_campaignSynch.htm > ready > $.ajax success: " + data);

        debugger;

    },
    error: function (XmlHttpRequest, textStatus, errorThrown) {
        console.log("cc_campaignSynch.htm > ready > $.ajax error: " + XmlHttpRequest.responseText);
    }
});

Snapshot of data returned:

Updated Snapshot (JSON.parse used):

Might be something of nothing, but try changing "datatype" to "dataType"

To force jQuery magic work and recognize the data type, try to send the response back with HEADER: "Content-Type: application/json".