What methods can be used to write-protect USB flash memory during acquisition?

The correct answer is comprehensive because it encompasses a variety of methods that can be implemented to write-protect USB flash memory during data acquisition.

Engaging the write-protect switch, if available on the USB flash drive, is a straightforward hardware method that physically prevents any writing actions to the drive. This is important in forensic scenarios where the integrity of the data must be maintained, ensuring that any evidence remains unaltered.

Modifying the registry in Windows XP SP2 to make USB drives read-only adds a layer of software protection, preventing any data from being written to the USB flash drive while it is connected to a Windows system. This method is particularly useful when hardware-based write protection is not available.

Using ENBD/ENBCD USB DOS drivers, which are specialized drivers designed for forensic purposes, allows for additional control over how the USB flash media interacts with the operating system. This can help lock the Flash media and ensure it is not inadvertently modified during the acquisition process.

All these methods aim to safeguard the original data, which is crucial for forensic investigations. Therefore, recognizing the effectiveness and applicability of each method justifies the choice that all of the options provided can be used to write-protect USB flash memory during acquisition.