Final answer:
The domain of the relation is D - 4, 7, 8, 12.
Step-by-step explanation:
The domain of a relation refers to the possible input values, or x-values, in the relation. To find the domain, we look at the given options and select the one that includes all the input values in the relation. In this case, the correct domain for the relation is option D - 4, 7, 8, 12. This option includes all the given values in the relation.