Operating Sysytems:

Is this the correct answer? Privileged and unprivileged instructions got me confused

Is the Main Memory the only possible answer to this question?

Please explain clearly.

Thank you :)

Which of the following is most true about the dual operating mode? This mode was designed to optimize execution speed of OSs. Both OSs and user processes run in the same mode. The OS executes in system mode and processes execute in user mode. However, only the OS can execute unprivileged instructions. The OS executes in system mode and processes execute in user mode. However, only the OS is allowed to execute privileged instructions. Processes execute in system mode and the OS executes in the user mode. None of these choices are true. Select the large storage devices directly accessible by the CPU. Secondary Storage Thumb Drive Main Memory SSD Hard Disk