Which of these counts as capital in the list of factors of production?

1. Capital is the tools, machinery, equipment and buildings used to produce goods and services and move them to the consumer. 2. Machinery on the factory floor is exactly that, so it is capital. 3. A bank loan is money, and money is not one of the basic inputs. 4. The skill of a technician is labor, and iron ore in its natural state is a natural resource. _Source: OpenStax Introduction to Business (CC BY 4.0), Ch 1 "Understanding Economic Systems and Business", section 1.1 The Nature of Business_