You are creating a Windows Communication Foundation service by using Microsoft .NET Framework 3.5.
The service will contain an enumeration named OrderState.
The OrderState enumeration will contain the following four values: Processing, Cancelled, Confirmed, Closed.
The client application must be able to set the state of an Order entity to only the following two values: Cancelled, Closed.
You need to create the data contract for OrderState.
Which code segment should you use?

A.
[DataContract]
public enum OrderState
{
Processing=1,
[DataMember] Cancelled=2,
[DataMember] Confirmed=3,
Closed=4
}

B.
[DataContract]
public enum OrderState
{
Processing=1,
[EnumMember] Cancelled=2,
Confirmed=3,
[EnumMember] Closed=4
}

C.
[DataContract]
public enum OrderState
{
[EnumMember(Value="False")] Processing=1,
[EnumMember(Value="True")] Cancelled=2,
[EnumMember(Value="True")] Confirmed=3,
[EnumMember(Value="False")]
Closed=4
}

D.
[DataContract]
public enum OrderState
{
[DataMember] Processing=1,
[DataMember(IsRequired=true)] Cancelled=2,
[DataMember] Confirmed=3,
[DataMember(IsRequired=true)] Closed=4
}