PrincipalPermission Attribute with multiple roles

Hi,

I am looking for the correct syntax in VB.NET for multiple
roles in the
PrincipalPermission attribute.

Is it
a. (SecuerityAction.Demand, Role:="Reviewers,
Admins")

or

b. (SecurityAction.Demand, Role:="Reviewers",
Role:="Admins")>

Thank you

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