What Does a Comparison of the Specific Types of Skills

What does a comparison of the specific types of skills used by the different levels of management suggest?

A) Top-level managers are the only level of management that must use both human and technical skills.
B) Top-level managers call on their conceptual skills more than other levels of management do.
C) First-line managers have very little need for technical skills but make extensive use of both human and conceptual skills.
D) Middle managers mainly rely on technical skills, top managers mainly rely on human skills, and first-line managers mainly rely on conceptual skills.