Which is the most accurate statement regarding EEG and MEG techniques?

A Both rely on an injection of a radio isotope so that it can be tracked as it migrates to the brain.

Both are able to show the structure, as well as the function, of different brain areas.

Neither is very sensitive to activity in subcortical structures.

While EEG is a noninvasive technique, MEG requires the use of anesthesia and hospital admission.