Option D: T
A relation is simply relating or mapping one item of domain set to any number of items of the range set.
When the number of items the domain values are mapping to is limited to only 1, then that type of relation is called as function.
For given tables, all the first three tables are function as no single value of x has two values.
But looking at the table T,
the value of x = 3 has y = 4 and y = -4.
This tells that number x = 3 is related to two values in the range which shows that its not a function but mere a relation.
Thus answer is T which is shown by Option D : T
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