Which item can properly be called a part of infrastructure?

Question

Quizplus · Accepted Answer

The Confederation Bridge is a physical structure that provides a transportation link between Prince Edward Island and New Brunswick, making it a clear example of infrastructure.

Alternatively, another correct answer could be: 
Answer: A 
 While robots on an assembly line may not be a traditional definition of infrastructure, they do contribute to the efficient management of industrial production, which can be considered a type of infrastructure.

Which Item Can Properly Be Called a Part of Infrastructure