Final answer:
A differentially private search algorithm adds noise to maintain privacy, which compromises the accuracy of the results. The correct answer is C: Noise, accuracy, as it denotes the trade-off between privacy preservation and data accuracy.
Step-by-step explanation:
A differentially private search algorithm would add some noise at the expense of accuracy. Therefore, the correct answer is C: Noise, accuracy. Differential privacy is a system for publicly sharing information about a dataset by describing the patterns of groups within the dataset while withholding information about individuals in the dataset. By adding random noise to the data, it becomes more difficult to infer information about any individual, thus preserving privacy. However, this noise can decrease the accuracy of the results provided by the algorithm as it may distort the true data points slightly to ensure privacy is maintained.