What shows the order in which these structures are involved in a reflex action?
1 )
effector $ \to $ motor neurone $ \to $ relay neurone $ \to $ sensory neurone $ \to $ receptor
2 )
effector $ \to $ sensory neurone $ \to $ motor neurone $ \to $ relay neurone $ \to $ receptor
receptor $ \to $ sensory neurone $ \to $ relay neurone $ \to $ motor neurone $ \to $ effector
4 )
receptor $ \to $ motor neurone $ \to $ sensory neurone $ \to $ relay neurone $ \to $ effector
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