are unique because the technology is based on the human brain and focuses on pattern recognition from large data sets.

Neural networks are unique because the technology is based on the human brain and focuses on pattern recognition from large data sets.
Each neural network differs from one another - every person in the world has their own neural network of synapses and nerves in their body that is completely different than that of another person's. Thus, these networks are unique, because human brains are unique. 

The correct answer to this question would be c

The correct answer is b