The most common size for a brochure is

3.5 x 2
legal size - 8.5 x 14
letter size - 8.5 x 11
all of the above
none of the above

3.5X2 cannot be the answer as it too small and not enough information can be put into it. The common size for tri-fold brochures is 8.5X11 or letter size even when 8.5X14 is also a size used it is not the most common size.

Answer the important painting of the baptism of the christ, leonardo painted the kneeling angel and some of the background for this;

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.