Answer: Onto.
- A One-one but not necessarily onto
- B Neither one-one nor onto
- C Bijective in every case
- D Onto
Correct answer: D. Onto
Explanation: Each c ∈ C has a preimage b under g, and that b has a preimage a under f, so g(f(a)) = c.
Concept context
Types of relations, equivalence classes, one-one and onto functions, composition, and invertible functions