The correct answers are A and D. Zombies and botnets are types of infections that allow malicious actors to remotely control infected computers and use them to launch distributed denial-of-service (DDoS) attacks against a target. A DDoS attack is a type of cyberattack that aims to overwhelm a server or a network with a large volume of traffic from multiple sources, causing it to slow down or crash.

A keylogger is a type of malware that records the keystrokes of a user and sends them to a remote server, often for the purpose of stealing passwords, credit card numbers, or other sensitive information.

Adware is a type of software that displays unwanted advertisements on a user’s computer, often in the form of pop-ups, banners, or redirects. Adware can also collect user data and compromise the security and performance of the system.

Ransomware is a type of malware that encrypts the files or locks the screen of a user’s computer and demands a ransom for their restoration. Ransomware can also threaten to delete or expose the user’s data if the ransom is not paid.

Spyware is a type of software that covertly monitors and collects information about a user’s online activities, such as browsing history, search queries, or personal data. Spyware can also alter the settings or functionality of the user’s system without their consent.