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In theory, you could use both. The case is formulated in a rather convoluted way.
In the actual case interview, I'd discuss this with the interviewer. At the end of the day, that's what they're out to test - your way of thinking through a problem.
Best, Cristian
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Honestly, I agree. I think either # would work, but the important thing is to check with the interviewer and propose. Basically saying “I can use either #x or #y. I'm thinking of using # y but happy to use whichever # the client prefers”