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- 单项选择题 You are creating a Windows Communication Foundation (WCF) service that uses claims-based authorization. The following code retrieves the correct claim set.var claims = ServiceSecurityContext.Current.AuthorizationContext.ClaimSets[0];You need to validate that the requesting client application has included a valid DNS value in the claim. Which code segment should you use to retrieve the claim for validation?（）
A、claims.FindClaims(ClaimTypes.Dns, Rights.PossessProperty).FirstOrDefault();
B、claims.FindClaims(ClaimTypes.Dns, Rights.Identity).FirstOrDefault();
C、claims.ContainsClaim(Claim.CreateDnsClaim(ClaimTypes.Dns));
D、claims.Equals(ClaimTypes.Dns);
- A
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