B&O

What is the full meaning of B&O? What does B&O stand for?

  1. B&O stands for Baltimore & Ohio (Railroad)
  2. B&O stands for Band and Orchestra
  3. B&O stands for Bang & Olufsen (Danish audio/electronics company)
  4. B&O stands for Belladonna and Opium (treatment)
  5. B&O stands for Business and Occupation (Tax)