Final answer:
Alice should use a write blocker to copy a drive without the risk of modifying its contents as it prevents any writing commands during the copying process.
Step-by-step explanation:
Alice needs to use a device that ensures the integrity of the data on the drive she wants to copy. The correct device for this purpose is a write blocker. A write blocker is a hardware device or software application that prevents any commands that could write data to a storage device, thereby ensuring that the original drive is not altered in any way during the copying process. It is commonly used in forensic investigations to create an exact bit-for-bit copy of a drive. On the other hand, options A and D are not devices, and a drive cloner could, potentially, modify the source if not used correctly.