Step 1: Understand the role of a manager.
The role of a manager is to lead and guide employees towards achieving the organizational goals, often through leadership.
Step 2: Evaluate the options.
- While a manager may also be considered a boss, the primary role is that of a leader, guiding the team to success.
- The owner may not always be the manager, and "none of these" is incorrect as leadership is central to management.
Step 3: Conclude.
The manager’s role is more aligned with being a leader than just a boss or owner.
Final Answer:
\[
\boxed{\text{Leader}}
\]