Demi loves playing online games. she surfs through many websites to find new, interesting games. one day she finds that her mailbox is filled with emails suggesting websites for online games and ads promoting a few online offers. in this scenario, a(n) tracks demi's computer behavior to send her targeted mails and ads.
a. firewall
b. spyware
c. bastion host
d. attack tree

Option (B) is the correct answer.

Explanation:

The following terms are as follows:

Firewall: Firewall can be described as a security system for a network, which is used to check the incoming and outgoing data on the network on the basis of rules determined by the system.

Spyware: Spyware defines as a program that can record your activity secretly and then use it for many purposes i.e advertisements, promotions, and many other legal and illegal purposes.

Bastion host: Bastion host mainly used to access the private network from any other network.

Attack trees: Attack trees are used to examine the security of any system against any attacks.

According to the scenario, the most appropriate answer is option (B) because spywares are also used for promotion.