A forensic expert needs to recover deleted or corrupted files from a disk partition. Which of the following tools should the expert use?

The appropriate tool for recovering deleted or corrupted files from a disk partition is Foremost. This is a forensic data recovery tool specifically designed to extract and recover files from disk images and file systems, making it highly effective for recovering lost data. Foremost works by analyzing the file headers, footers, and internal data structures to identify and reconstruct lost files based on known patterns.

In contrast, hexdump is used primarily for viewing the raw data in files in a hexadecimal format, which can help analyze the contents of a file but is not equipped for data recovery tasks. Ghidra is a reverse engineering tool mainly used for analyzing binary code and software, particularly malware, rather than for file recovery. OllyDbg is an advanced debugger for analyzing and debugging Windows binaries, and while it can help in understanding executable files, it does not serve the purpose of recovering deleted files from disk partitions.

In summary, Foremost is tailored for the specific objective of file recovery due to its design and functionality, making it the best choice among the listed tools.