Which statement explains the difference between a nerve that is connected to the skin and a nerve that is connected to a muscle?

a.) the nerve that is connected to skin is a motor neuron; the nerve that is connected to a muscle is a sensory neuron.
b.) the nerve that is connected to skin receives stimuli information from the external environment; the nerve that is connected to a muscle receives processed stimuli information from the brain.
c.) the nerve that is connected to skin is part of the central nervous system; the nerve that is connected to a muscle is part of the peripheral nervous system.