Procurement refers to the process of acquiring goods or services from external sources. It involves activities such as sourcing, negotiating contracts, purchasing, and managing supplier relationships. In the given options, Legal & Corporate Affairs, Human Resources, and Shared Services are all internal functions within an organization, while Procurement is the only option that deals with external suppliers. Therefore, Procurement is the correct answer as it is the only option that aligns with the concept of acquiring goods or services from external sources.