XAT 2018 Question 47
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XAT
Option A is limiting the choices, not the best solution in this case.
Option B is incorrect as it increases operational effort for Madhuri.
Option C is ruled out as cleaner cannot stay whenever guests leave the apartment..
Option D addresses the concerns that customers don't leave the keys behind, as well gave an option to recover a portion of the cost, if such incidents still occur.
Option D is correct.