What is the maximum number of pseudowires that needs to be provisioned throughout the service provider network in order to have full Layer-2 connectivity among all sites?

A service provider plans to offer Virtual Private LAN Service to a customer who has 10 sites, and the customer edge switches are attached to 8 provider edge switches. What is the maximum number of pseudowires that needs to be provisioned throughout the service provider network in order to have full Layer-2 connectivity among all sites?

A.
10

B.
8

C.
28

D.
45