What is the difference between a tag definition and a tagged value?

What is the difference between a tag definition and a tagged value?
A . The properties of metaclasses are sometimes referred to as tag definitions. When a metaclass is applied to a model element, the values of the properties may be referred to as tagged values.
B . The properties of stereotypes are sometimes referred to as tagged values. When a stereotype is applied to a model element, the values of the properties may be referred to as tag definitions.
C . The properties of stereotypes are sometimes referred to as tag definitions. When a stereotype is applied to a model element, the values of the properties may be referred to as tagged values.
D . They are synonyms.

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Answer: C