Ntdll.dll is the Windows user-mode system library that provides many internal NT functions (commonly exposed as “NT Native API” routines such as Nt* / Zw* ) and, critically, contains the system service dispatch stubs used 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 in Kernel32.dll ), which then ultimately rely on Ntdll.dll to perform the final step of invoking the kernel through these system call stubs. This is why Ntdll.dll is a core component loaded into nearly every process and is tightly associated with the boundary between user mode and the executive components of the OS.

From a forensics viewpoint, understanding Ntdll.dll matters 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.exe is the kernel image itself (core kernel/executive), Win32k.sys is a kernel-mode graphics/windowing subsystem component, and Kernel32.dll provides higher-level Win32 APIs rather than the primary system-call stub layer. Hence, Ntdll.dll (C) is the correct answer.

Bulk Extractor is a digital forensics utility specifically designed to scan storage media (or forensic disk images) and automatically extract structured artifacts and metadata-like features without relying strictly on file system parsing. In Windows investigations, it is commonly used to identify and pull out items such as email addresses, URLs, domain names, credit card patterns, timestamps, GPS coordinates, and other feature records that can be treated as metadata indicators during triage and deep analysis. Because it works by scanning raw data blocks and producing feature reports, it can recover useful information even when files are deleted, partially corrupted, or when file system structures are damaged—conditions frequently encountered in forensic cases. Investigators use its outputs to correlate user activity, locate sensitive data exposure, and identify evidence-rich regions for further examination with file-level tools.

The other options do not match the requirement of analyzing file metadata broadly. Tor browser is an anonymity-focused web browser, not a forensic metadata analyzer. IECachesView is a niche utility for viewing Internet Explorer cache/history artifacts rather than general file metadata analysis. Paraben P2 Commander targets peer-to-peer investigations and related artifacts, not general metadata extraction across files. Therefore, the correct tool for analyzing metadata-like artifacts on a Windows-based system is Bulk Extractor (A) .