Of the following pairs of terms, the incorrect one is__________:

A. oligodendrocytes/synthesis of myelin sheaths in the PNS.

B. astrocytes/metabolic waste removal and modulation ofneurotransmitter release at the axon terminal.

C. microglia/removal of metabolic waste and antibacterial andantifungal function as an extension of the immune system.

D. radialglia/assist migrating neurons during embryogenesis.