The correct answer is: Personal development planning
Rationale: Personal development planning is something the individual does for his or her own improvement and learning, although a coach, mentor or counsellor may facilitate this process.
The other three options are all types of 'developmental relationships': a coach helps a trainee for a brief period to work on job-relevant skills; a mentor helps a less experienced person over the long term to work on more general personal development issues; and a counsellor helps an individual to work through emotional or social issues or problems.
Pitfalls: These are distinct roles: make sure you can identify them correctly.