I have a quick question about namespace naming standards:

Let's say I have 3 separate systems: Customer, Dealer, and Employee. I want to separate the tier into logical namespaces.

Which naming method is the best:
YLT.Customer.BLL
YLT.Dealer.BLL
YLT.Employee.BLL
YLT.Customer.DAL
YLT.Dealer.DAL
YLT.Employee.DAL

or

YLT.BLL.Customer
YLT.BLL.Dealer
YLT.BLL.Employee
YLT.DAL.Customer
YLT.DAL.Dealer
YLT.DAL.Employee