(i) f is a relation from A to B (ii) f is a function from A to B. Justify your answer in each case.

(i) (a, a) ∈R, for all a ∈N (ii) (a, b) ∈R, implies (b, a) ∈R (iii) (a, b) ∈ R, (b, c) ∈ R implies (a, c) ∈ R Justify your answer in each case.