Step 1: Understand the objective of development.
The objective of development is multi-faceted, involving promotion opportunities, better performance, and skill enhancement.
Step 2: Evaluate the options.
- Development typically includes enhancing skills, improving performance, and providing opportunities for advancement.
- All the options are part of a comprehensive development strategy.
Step 3: Conclude.
The objective of development encompasses all these aspects.
Final Answer:
\[
\boxed{\text{All of these}}
\]