Final answer:
The manager of the accounting department displays technical skills by having the specialized knowledge to answer questions about tax regulations. This displays an aspect of their professionalism and capability in their field.
Step-by-step explanation:
When the manager of the accounting department has the knowledge to answer his employees' questions about current tax regulations, he is displaying technical skills. These skills involve the specialized knowledge of subjects related to the task at hand—in this case, understanding tax regulations. Managers with strong technical skills can effectively answer questions, supporting their team and contributing to the department's success. This capability is often rooted in a manager's educational background and work experience which may include aspects of law, math, science, and technology relevant to their field.
Beyond the technical expertise, a manager's ability to communicate this knowledge clearly ties into good communication skills, which are essential for effective leadership. However, the question directly refers to the specialized knowledge that enables a manager to answer technical questions, making 'technical skills' the most accurate choice from the provided options.