Which of these is a type of man-in-the-middle attack on data confidentiality?a.)Physical attackb.)ARP cache poisoningc.)DDoSd.)DNS amplification attack

b.) ARP cache poisoning is a type of man-in-the-middle attack on data confidentiality.

Here's a step-by-step explanation:

1. A man-in-the-middle attack is a type of cyber attack where a malicious actor inserts themselves into a conversation between two parties, impersonates both parties and gains access to information that the two parties were trying to send to each other.

2. ARP cache poisoning is a technique by which an attacker sends (poisoned) Address Resolution Protocol (ARP) messages onto a local area network.

3. The aim is to associate the attacker's MAC address with the IP address of another host (such as the default gateway), causing any traffic meant for that IP address to be sent to the attacker instead.

4. This allows the attacker to intercept, modify or stop the data in transit, leading to a breach in data confidentiality.

5. Therefore, ARP cache poisoning is a type of man-in-the-middle attack on data confidentiality.

The other options mentioned, i.e., Physical attack, DDoS, and DNS amplification attack, are types of cyber attacks but they are not specifically man-in-the-middle attacks on data confidentiality.