Which Mechanism Causes a Postmitotic Cortical Neuron to Settle in a Particular

Which mechanism causes a postmitotic cortical neuron to settle in a particular layer depending on when it was born?

A) The neuron itself keeps track of its birthdate and targets the layer appropriate to its birthdate.
B) Cells in the destination cortical layer inform the migrating neuron to stop.
C) The neuron migrates without instruction and stops when there is an open space in the cortex.
D) The neuron receives destination information from the ventricular zone before it migrates.