Which statement describes code executing in user mode?

Complete and unrestricted access to underlying hardware is characteristic of kernel mode, not user mode, which is designed to protect system stability and security.

While user mode code can *request* the kernel to perform I/O functions via system calls, it does not directly 'switch to kernel mode execution' itself; the kernel handles the transition and execution of the privileged operation.

Accessing every memory address and executing any CPU instruction are privileges of kernel mode, whereas user mode operates within strict memory and instruction set limitations for security and stability.

User mode code is executed in a restricted environment, preventing direct access to hardware and limiting memory access to its own virtual memory space. To perform privileged operations like hardware I/O or accessing system memory, user mode applications must make system calls to the operating system kernel, which then executes the request in kernel mode.