The ends of three metal rods are examined by bringing end Q of rod 1 near the others one by one. The observations are listed below. End Q attracts end R. End Q attracts end S. End Q attracts end T. End Q repels end U. Which of the metal rods is a magnet?
- Arod 1 only
- Brod 1 and rod 2
- Crod 1 and rod 3
- Drod 3 only