we are given a relation
R={(-2,6), (1,8) , (3,4), (-3,8) , (c,d)}
We know that any relation is a function when it does not have same input value for two different output values
we will verify each options
option-A:
(-3,5)
We have (-3,8)
which means have same input (-3) but different output(5 and 8)
so, this is FALSE
option-B:
(-2,8)
We have (-2,6)
which means have same input (-2) but different output(6 and 8)
so, this is FALSE
option-C:
(1,-8)
We have (1,8)
which means have same input (1) but different output(- and 8)
so, this is FALSE
option-D:
(3,4)
We have (3,4)
which means have same input (3) and also has same output (4)
so, this is TRUE