Encryption is the way to go, no doubt about it. Although, I have to say, the idea of segmentation sounds a bit like building a data fortress. 'Keep out, this data is mine!' *laughs*
I agree, encryption is the way to go here. Hashing wouldn't work since it's a one-way process, and tokenization just replaces data with a non-sensitive equivalent. Segmentation is more about isolating data, not making it unreadable.
This question is definitely testing our knowledge of data protection techniques. Hmm, I think the answer is encryption. It's the most common way to ensure sensitive data at rest is unreadable to unauthorized parties.
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