Consider the schema R(A, B) foreign key (B) references to S
S(A, B) foreign key (A) references to R
(None of the attributes are nullable)
Which of the following is guaranteed to produce fewer than, or at most the same, number of tuples as any of the others?
a. πA(R) ⋈ πB(S).b. R ⋈ πB(S).c. R ⋈ S. d. πA(R) ⋈ S. e. None of the above.

answerdmz;

create an interactive presentation of ms powerpoint or any other presentation software in which define the product's characteristics, benefits, why people consider it, etc.

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.