What indicates the sequence in which these structures take part in a reflex action?
- Aeffector $\rightarrow$ motor neurone $\rightarrow$ relay neurone $\rightarrow$ sensory neurone $\rightarrow$ receptor
- Beffector $\rightarrow$ sensory neurone $\rightarrow$ motor neurone $\rightarrow$ relay neurone $\rightarrow$ receptor
- Creceptor $\rightarrow$ sensory neurone $\rightarrow$ relay neurone $\rightarrow$ motor neurone $\rightarrow$ effector
- Dreceptor $\rightarrow$ motor neurone $\rightarrow$ sensory neurone $\rightarrow$ relay neurone $\rightarrow$ effector