Indicate Whether Each of the Following Descriptions Better Applies to the Scanning

Short Answer

Indicate whether each of the following descriptions better applies to the scanning (S) or transmission (T) electron microscopy techniques. Your answer would be a four-letter string composed of letters S and T only, e.g. TSTS.
( ) It generally has a greater depth of field.
( ) It is usually smaller, cheaper, and simpler.
( ) It detects electrons that are scattered or emitted from the specimen.
( ) It is used to create electron-microscope tomograms.