The assembly pieces must be very small. The assembly process must remain exactly the same. Robots require regular maintenance. Robots must be provided with electricity.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Robots can perform tasks that are dangerous for humans. What is the MAJOR limitation to the use of robots?
Possibilities:
- The assembly pieces must be very small.
- The assembly process must remain exactly the same.
- Robots require regular maintenance.
- Robots must be provided with electricity.

The assembly process must remain exactly the same.