Which is the correct sequence of the components of a reflex arc?

Receptors$\to$Muscles$\to$Sensory neuron$\to$Motor neuron$\to$Spinal cord

Receptors $\to$Motor neuron $\to$Spinal cord $\to$Sensory neuron $\to$Muscles

Receptors $\to$Spinal cord $\to$ Sensory neuron $\to$Motor neuron$\to$ Muscles

Receptors$\to$ Sensory neuron $\to$Spinal cord $\to$Motor neuron $\to$Muscles