Final answer:
Juana, as the Vice President of Human Resources, is involved in a support activity within the value chain, as her role provides essential backing to the primary functions of the business.
Step-by-step explanation:
As the Vice President of Human Resources, Juana performs in the part of the value chain known as a support activity. In the context of the value chain, support activities are those that provide the necessary backing to the primary activities of a business, which directly contribute to the production of products or services. Human resources, being responsible for employee-related functions such as hiring, training, and benefits administration, is a key area that enables the organization to maintain an effective workforce, thus supporting the organization's overall strategy and operational efficiency.