RFC 3270 describes Differentiated Services (Diff-Serv) over Multi-Protocol Label Switching (MPLS) networks. Which model alters Differentiated Services (Diff-Serv) code points set in different Differentiated Services (Diff-Serv) domain?

A.
Uniform model

B.
Pipe Model

C.
Short Pipe

D.
None of the above will alter Differentiated Services (Diff-Serv) code points set in different Differentiated Services (Diff-Serv) domain.