Final answer:
The exact nature of the attack on a system with a spreadsheet open and connected to the Internet is not specified clearly in the options provided, and more information is needed to diagnose the issue accurately. Logic bombs, worms, viruses, and the incorrectly stated 'ACK attack' are potential cybersecurity threats, but the given details are insufficient for a conclusive determination.
Step-by-step explanation:
When a system stops responding while a spreadsheet is open and connected to the Internet, none of the options provided convincingly describe the exact nature of the problem, as more information is required to accurately diagnose the issue. However, the scenarios described in the options are:
- A Logic Bomb is a piece of code inserted into software that triggers a malicious action when certain conditions are met.
- A Worm is a standalone malware program that replicates itself in order to spread to other computers.
- A Virus is a type of malware that, when executed, replicates by inserting copies of itself into other computer programs, data files, or the boot sector of the hard drive.
- An ACK attack, likely referencing another type of cybersecurity threat, is not a commonly recognized term, but it may be confused with a TCP ACK flood, which is a type of Denial-of-Service (DoS) attack.
Without more specific information about the symptoms or the nature of the incident, it is not possible to definitively say which attack occurred, if any at all. Understanding the exact behavior and impact on the system would be necessary to narrow down the cause.