The Usefulness of Pseudorabies Virus for Histological Analyses Is

The usefulness of pseudorabies virus for histological analyses is

A) for the tracing of serial synaptic connections.
B) for the tracing of afferent fibers.
C) because it is an excitotoxin like kainic acid.
D) for the tracing of efferent fibers.
E) that this virus only affects nerve cells outside the brain and spinal cord.