All Sensory Systems Are Able to Generate Action Potentials

All sensory systems are able to generate action potentials.How are different stimuli (chemical, light, sound, etc.) recognized as different sensations?

A) Receptors respond differently to different types of stimuli.
B) Action potentials from different types of sensory cells are combined in the brain.
C) Action potentials from different types of sensory cells arrive at different places in the central nervous system.
D) The frequency of action potentials encodes the type of stimulus.
E) The strength of the stimulus determines the type of sensation.