a) A special version of a value type that is represented by a structure
b) A nullable type can also store the value null
c) Nullable types are objects of System.Nullable, where T must be a non nullable value type
d) All of the mentioned
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d
Explanation: A nullable type is a special version of the value type that is represented by a structure. In addition to the values defined by the underlying type, a nullable type can also store the value null. Thus, a nullable type has the same range and characteristics as its underlying type. It simply adds the ability to represent a value which indicates that a variable of that type is unassigned. Nullable types are objects of System.Nullable, where T must be a nonnullable value type.