Please assist with question 3

A company that manufactures wooden products (e.g. dining tables, living room fumiture and outdoor furniture) regularly maintains their machines, which are used for cutting and shaping components. The manager would like to know whether the cost of machine maintenance is related to the age of the machines. For a random sample of 10 machines in the company's factory, the annual maintenance cost (in R100s) and age of each machine was recorded. What is the independent variable in this study is identified as? Select one: O a. Wooden products O b. Machine cost O c. Machine age (years) Ad. Annual Maintenance Cost