Proper way to distribute Bonjour enabled Windows application

I am quite confused as to the proper way of distributing Bonjour as a part of a Windows application that would publish a service for a client iOS app.

No matter how much I google around, I cannot find a clear how-to guide. It would be great if someone could provide guidelines.

The main reasons of my confusion are:

• Is it mandatory to distribute the entire bonjour Win SDK as a part of my Win application?
• Since Apple provides source code to build mDNSResponder.exe, is it sufficient to only distribute such file along with dns-sd.dll?
• What is the intended purpose of providing sources for mDNSResponder.exe otherwise?
• What is the recommended way to handle the possibility of having Bonjour already installed on the system?
• Also, where can I find the latest Bonjour SDK (3.x I guess?), I can only find 2.0.4. Is it only accessible if I am enrolled in the OSX developer program? (I am enrolled in iOS developer program for now.)

Many thanks.