According to the center for 21st century skills, critical thinking ability includes all of the following skills, except a. reason effectively b. solve problems c. communicate clearly d. use systems thinking

you're giving away points because you can't type stuff out.

explanation:

answer(igmp);

(a) oldest

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.