Final answer:
HP was not founded by former employees of any of the disrupted giants; it predates them all, having been founded in 1939 by Bill Hewlett and Dave Packard.
Step-by-step explanation:
The correct answer to the question is that Hewlett-Packard (HP) was not founded by former employees of any disrupted giant listed in the options (IBM, Microsoft, Apple, or Dell). In fact, HP was founded earlier than any of these companies by Bill Hewlett and Dave Packard in 1939.
Therefore, the question as posed carries a misconception. Hewlett and Packard began their business in a garage in Palo Alto, California, which is now considered the birthplace of Silicon Valley. In 1976, Steve Jobs founded Apple Computer, and IBM entered the personal computing market in the early 1980s, several decades after HP was established. Similarly, Microsoft was founded in 1975 by Bill Gates and Paul Allen, and Dell was founded by Michael Dell in 1984, all well after HP's initial establishment.