A system is running a version of an operating system as a client of the host operating system. Which of the following best defines this circumstance?
a. The system is running a virtual machine or emulator of the host operating system.

b. The system is dual-booted with the host operating system.

c. The system is accessing the host operating system through a remote desktop or similar connection.

d. The system is running a virtual desktop infrastructure (VDI) client to access the host operating system.