Which of the following would be considered a logical access control?A fingerprint reader that allows an employee to access a laptop computerAn iris reader that allows an employee to enter a controlled areaA fingerprint reader that allows an employee to enter a controlled areaA chain attached to a laptop computer that connects it to furniture so it cannot be taken

A logical access control refers to a system that manages access to computer and network resources. It's based on individual user identification, authentication, authorization, privileges and other controls. It's not about physical access to devices or areas, but about access to systems and networks.

From the options given:

1. A fingerprint reader that allows an employee to access a laptop computer
2. An iris reader that allows an employee to enter a controlled area
3. A fingerprint reader that allows an employee to enter a controlled area
4. A chain attached to a laptop computer that connects it to furniture so it cannot be taken

The first option, "A fingerprint reader that allows an employee to access a laptop computer", would be considered a logical access control. This is because it controls access to the laptop's system based on the individual's unique fingerprint.

The other options involve physical access control (options 2 and 3, which control physical entry to a location) or a physical security measure (option 4, which is a deterrent against theft).