Which imaging method is the only one that reveals the internal structures of a virion?

1. Both scanning and transmission electron microscopy show the surface structure of virions. 2. Only transmission electron microscopy shows what lies inside the particle. 3. A light microscope cannot resolve viruses at all, apart from some large poxvirus virions. 4. Scanning electron microscopy stops at the outer surface, so it is the trap answer here. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 21 "Viruses", section 21.1 Viral Evolution, Morphology, and Classification_