Melania is responsible for reviewing authentication logs on her organization's network. She does not have the time to review all logs, so she decides to choose only records where there have been four or more invalid authentication attempts. What technique is Melania using to reduce the size of the pool?

The two main methods of choosing records from a large pool for further analysis are sampling and clipping. Sampling uses statistical techniques to choose a sample that is representative of the entire pool, while clipping uses threshold values to select those records that exceed a predefined threshold because they may be of most interest to analysts. In this case, Melania is only selecting records that exceed an invalid login threshold, making this an example of clipping.