Nerve fibers in dorsal rootlets:

synapse in the dorsal horn and carry only afferent, sensory fibers.
synapse in the dorsal horn and carry only afferent, motor fibers.
synapse in the dorsal horn and carry only efferent, sensory fibers
synapse in the dorsal horn and carry both afferent and efferent fibers
synapse in the dorsal white matter and carry both afferent and efferent fibers.