Which one of the following statements is correct about $\mathrm{N}_2, \mathrm{CO}$, and $\mathrm{NO}^{+}$?

• A

  These are not isoelectronic but have identical bond order.
• Correct answer
  B

  These are isoelectronic and have identical bond order.
• C

  These are neither isoelectronic nor have identical bond order.
• D

  These are isoelectronic and have different bond orders.

Hence, the correct answer is option: 'B'.