Which type of object should you create?

You are developing a Windows Store app.
The app has the following requirements:
Access resources from the URI ws://contoso.com/MyWebApplication.ashx.
Send and receive binary data.
Use real-time notifications and updates in the browser.
Use a bidirectional, full-duplex communication channel with services.
You need to ensure that the app meets the requirements.
Which type of object should you create?

A.
Worker

B.
WebSocket

C.
MessageChannel

D.
XmlHttpRequest

E.
WebService