Which Features Does Not Allow You to Identify Gap Junctions

Which features does not allow you to identify gap junctions between two neuronal processes in electron microscopy images?

A) There is no synaptic vesicle on either side of the junction.
B) The space between the two membranes is narrower than outside of the gap junction.
C) There is an electron-dense thick region on both sides of the membrane.
D) The connexins of each connexon are readily visible with electron microscopy resolution.
E) The gap junction can be formed between two dendrites.