In what format does C# expect data to be streamed?

1. Simple binary
2. SOAP
3. Unserialized

Option 1 is correct. Binary formatters serialize messages into binary code. They work faster than SOAP formatters, and are ideal for intranets.

Option 2 is correct. Simple Object Access Protocol (SOAP) is a mechanism for information exchange. It allows a program running in one kind of operating system – such as Windows 2000 – to communicate with a program in the same or another kind of operating system – such as Linux.

Option 3 is incorrect. Any object that is streamed to disk must be serialized and marked with the [Serializable] attribute. This includes any objects contained within a serializable object.