SSO for Multiple Domains, as Trust based connection MVC 4

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C#3.5

SSO

domain

MVC4

Hi all,
I am creating website for my client, My client requirement is to access his web application through multiple domain with trust based connection. They told me to do SSO using Active directory users with different multiple domains. I am new to this, I don't know what should I use authentication i.e. forms or Windows and how to configure SSO with trust based connection and how to design the architecture.

User will not enter username and password Web Application will authenticate using Active Directory Users but Multiple domain users should access the application.

What I found is this

http://stackoverflow.com/questions/21188345/single-sign-on-inside-asp-net-mvc-web-application[^]

I don't have much idea about this. If you can give me basic idea or startup idea then it will be great.