Which of the following relations represents a function?

a. {(1, 1), (1, 2), (1, 3)}
b. {(1, 1), (2, 1), (3, 1)}
c. {(1, 1), (2, 2), (3, 3)}
d. both b and c.

Alternative D is correct

Step-by-step explanation:

For a relation to qualify as a function, a unique x value should be mapped to a unique y-value or unique x-values be mapped to the same y-value

since proposition states that a number is greater than 25, if is true then the number must actually be greater than 25.

this implies that all possible options, except 24, can be accepted