What features are included in most dtp programs?
grid lines.
layering.
printers’ marks.
red eye editing.
threading.
video formatting. wysiwyg. (more than one answer)

Grid lines.  

Layering.  

Printers’ marks.  

Threading.  

WYSIWYG.

Explanation:

DTP means DeskTop Publishing, meaning you do on your computer what was used to be done in a printer shop alone and you format the layout of a newspaper for example.  Most of the choices offered are related to a DTP program:

Grid lines: definitely, to align elements and measure them.

Layering: yes, placing elements on top of others to provide a photo background to a boxed text area for example.

Printers’ marks: If you send your work to a printer shop, they'll need to know where to cut the paper, where the bleed is and so on.

Threading: Yes, that's when the text flows from one column to the next, in a multi-column layout, like a newspaper.

WYSIWYG: Of course, What-You-See-Is-What-You-Get is fundamental in DTP programs to help the creator see what he's doing.

The non-related ones:

Red eye editing: That's for a photo editing program.  Some DTP programs might have a photo editor built-in, but that would not be a requirement for DTP.

Video formatting: Publishing is mostly related to printed format... the goal is to produce a layout to be printed on paper (or other medium).  So, there's no need to do anything about videos in a DTP program.