Since MRNAs Appear to Not Rest but Continuously Patrol the Dendrites

Since mRNAs appear to not rest but continuously patrol the dendrites, how are they functionally regulated?

A) They travel in an active state but specific signal molecules located in the dendrites and axons allow them to localize.
B) The mRNA has a signal sequence that directs it to these locations
C) Polysomes are found in the key target areas.
D) They attach to actin and follow them to the dendrites and axons.
E) They travel in a repressed state but synaptic activity releases mRNAs from their translationally repressed state.