which of the statement are true about the passport Authentication?

Question

ASP.Net 3.5 using C#

 a.The passport sdk must be install.
    b.Passport authentication is a free service for all sites provided by the   microsoft corporation.
    c.Passport Authentication provides persistent authentication across sessions.
    d.Passport Authentication requires a network path between the client and the microsoft passport server.

Answer 1

There's no all of the above answer?

Answer 2

e. Passport authentication is deprecated in favour of Windows Live ID

(reference)