Solution

The correct answer is 1)(A) and (B) Only

EXPLANATION:

• (A) It can only be executed by the Operating System kernel and not by user applications. -
  • This statement is CORRECT. Privileged instructions are designed to be executed only by the Operating System kernel to prevent unauthorized access to critical system resources and ensure system stability and security.
• (B) It is designed to perform operations that can directly affect the hardware or system state such as I/O operations or changing memory management setting. -
  • This statement is CORRECT. Privileged instructions typically involve operations that can change the state of the hardware or system settings, which is why they require higher-level permissions to execute.
• (C) User applications can execute privileged instructions if they have the correct permissions, set by the Operating System. -
  • This statement is NOT CORRECT. User applications generally cannot execute privileged instructions directly, regardless of permissions set by the Operating System. This restriction is in place to protect the system from potentially malicious or erroneous code.
• (D) It usually executed in user mode to ensure the safety and security of the system. -
  • This statement is NOT CORRECT. Privileged instructions are usually executed in kernel mode, not user mode. Executing them in kernel mode ensures that only trusted code (the OS kernel) can perform critical operations, thus maintaining system safety and security.