Final answer:
Cultural skills are not traditionally listed as part of the essential six managerial skills, which include technical, conceptual, and interpersonal skills.
Step-by-step explanation:
The option that is NOT one of the six "must-have" managerial skills as traditionally outlined is c) Cultural skills. These six skills usually include technical skills, conceptual skills, interpersonal skills, communication skills, decision-making skills, and time-management skills. Cultural skills are certainly valuable in today's globalized business environment, but they are not typically listed as part of the traditional set of six essential managerial skills.
The traditional set of managerial skills focuses on managing tasks, people, and strategic decision-making. Technical skills relate to the ability to perform specific tasks related to a field or industry. Conceptual skills are about understanding complex ideas and how they relate to the organization. Interpersonal skills are crucial for interacting effectively with employees and other stakeholders.