What is the correct sequence in a reflex action?
1 )
receptor $ \to $ stimulus $ \to $ motor neurone $ \to $ relay neurone $ \to $ sensory neurone $ \to $ effector
2 )
receptor $ \to $ stimulus $ \to $ sensory neurone $ \to $ relay neurone $ \to $ motor neurone $ \to $ effector
3 )
stimulus $ \to $ receptor $ \to $ motor neurone $ \to $ relay neurone $ \to $ sensory neurone $ \to $ effector
stimulus $ \to $ receptor $ \to $ sensory neurone $ \to $ relay neurone $ \to $ motor neurone $ \to $ effector
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