Recomended way of implementing business layer

Hi,

I'm working on a multi-tier ASP.NET 2.0 application (Presentation L.,
Business L., Database Layer) and have the following two questions:

1) what is the recomended way of implementing ("hosting") the business
layer, implementation...
a) in IIS 6
b) .NET Remoting
c) as COM+
d) as WebService

Note: the application should support a large number of internet users (type
of online shop) and should be as secure as possible.

2) what is the recomended way of passing "a single" record between the
presentation layer and the business layer:
a) data transfer object (a class)?
b) DataSet (even if I know I have max one record)?
....

Many thanks
Stephan
.

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