One reason to display nonprinting characters in a document is to

Make sure they're the way you want them to be. Different fonts and font sizes display spacings differently, so by showing nonprinting characters you can check your numbers of spaces and line breaks.

The answer would be d (tables)

This is very true

cyberstalking on the internet means to harass or stalk someone, a group, or an organization. this may include defamation, slander, and false accusations. in many jurisdictions, cyberstalking is a criminal offense. 

on the other hand, cyberbullying focuses more on intimidating, threatening or harassing someone. harmful bullying include posting threats, rumors, and sexual remarks.