What does the UML specification say about choosing between a MOF-based metamodel and a UML profile?

What does the UML specification say about choosing between a MOF-based metamodel and a UML profile?
A . It is not always clear when to use one approach over the other; this decision must be domain-specific
B . It is always good to opt for metamodeling when the metamodel is large and the domain is inherently complex such as the database domain.
C . Since UML extends MOF. it is always preferable to start by extending MOF and. if this turns out to be complex, then shift to extending UML.
D . Extending UML should be favored because of the fact that there are several tools that support UML profiling, which is not the case for MOF.

Answer: A

Explanation:

The UML (Unified Modeling Language) specification, which is a part of the MOF (Meta-Object Facility) framework, suggests that the choice between creating a MOF-based metamodel and a UML profile depends on the specific needs of the domain being modeled. A MOF-based metamodel might be more appropriate for domains that require defining a completely new set of modeling concepts, whereas a UML profile is suitable for domains where the extension of existing UML concepts is sufficient. Since the specification recognizes the variability in modeling requirements across different domains, it emphasizes the importance of understanding the domain to make an informed decision on the modeling approach. The UML specification, therefore, does not prescribe a one-size-fits-all solution but rather leaves the decision to the modeler, based on the domain-specific requirements.