All the following sampling methods are available in the sample tool except:

The correct answer is based on the functionality available in the sample tool within Alteryx. The sample tool offers several options for sampling data, one of which is selecting "1 of every N rows," which allows users to systematically select rows at regular intervals. Another option is "First N%," which enables the user to take the first certain percentage of rows from the dataset. “Skip 1st N” is also included, allowing users to skip a specified number of rows from the beginning of the dataset before sampling.

However, the functionality to select "Last N%" is not typically available in the standard sampling options. While users can manipulate datasets to achieve a similar outcome, the sample tool does not directly provide an option to take a specified percentage from the end of the dataset. This is why the choice regarding selecting the last N% is the one that does not fit within the available methods in the sample tool.