Which of the following statements is TRUE?

Which of the following statements is TRUE?
A . Packet Sniffers operate on the Layer 1 of the OSI model.
B . Packet Sniffers operate on Layer 2 of the OSI model.
C . Packet Sniffers operate on both Layer 2 & Layer 3 of the OSI model.
D . Packet Sniffers operate on Layer 3 of the OSI model.

Answer: B