Which of the following Windows system files is created in the system drive after OS...

Ntdll.dllis the Windows user-mode system library that provides manyinternal NT functions(commonly exposed as “NT Native API” routines such asNt*/Zw*) and, critically, contains thesystem service dispatch stubsused by user-mode code to transition into kernel mode for operating system services. In standard Windows architecture, most user-mode applications call higher-level APIs (for example, Win32 APIs inKernel32.dll), which then ultimately rely onNtdll.dllto perform the final step of invoking the kernel through these system call stubs. This is whyNtdll.dllis a core component loaded into nearly every process and is tightly associated with the boundary between user mode and theexecutivecomponents of the OS.

From a forensics viewpoint, understandingNtdll.dllmatters because it is central to how processes request privileged services, and it is frequently referenced in analyses of process execution, API call chains, and certain user-mode hooking techniques used by malware or anti-forensics tools.

By contrast,Ntoskrnl.exeis the kernel image itself (core kernel/executive),Win32k.sysis a kernel-mode graphics/windowing subsystem component, andKernel32.dllprovides higher-level Win32 APIs rather than the primary system-call stub layer. Hence,Ntdll.dll (C)is the correct answer.