Consider a scenario where memory usage is critical, and you need to sort a large dataset stored on disk. Discuss the feasibility of using selection sort in this situation and propose an alternative approach if necessary.

Selection Sort is not feasible in this scenario due to its quadratic time complexity. Instead, External Sort, a class of algorithms designed for large datasets stored on external storage like disks, would be more appropriate. Merge Sort, adapted for external sorting, efficiently manages limited memory usage and minimizes disk I/O operations.