Final answer:
Knowledge workers, as defined by Peter Drucker, encompass individuals who are central to the new economy, require education, have the ability to utilize analytical knowledge, and must engage in continuous learning.
Step-by-step explanation:
According to Peter Drucker, knowledge workers are people who fall under 'e)' all of the above, meaning they are individuals who: a) are at the heart of the new economy; b) require a good deal of formal education; c) have the ability to acquire and to apply theoretical/analytical knowledge; and d) require a habit of continuous learning. Knowledge workers include professions such as engineers, scientists, doctors, teachers, financial analysts, and computer programmers. In an information-driven society, they are essential as the economy relies more on knowledge and services than on material goods. The rapid advancement of technology demands that knowledge workers not only have specialized information and skills but also the flexibility to adapt and grow as their roles evolve.