A consumer-packaged goods company is producing large volumes of hair shampoo and conditioners serving multiple markets. Which fulfillment strategy is it using in this case?

Assemble-to-order is a strategy where products are assembled only after an order is received, allowing for customization. This approach is not suitable for a consumer-packaged goods company producing large volumes of standardized products like shampoo and conditioners, which do not typically require customization.

Make-to-order refers to a production strategy that begins only after an order is placed, allowing for tailored products that meet specific customer requirements. This is not applicable in this scenario, as the company is producing large volumes intended for immediate sale rather than responding to individual orders.

Vertical integration is a business strategy where a company controls multiple stages of production or supply chain processes. While it can be beneficial for certain companies, it does not specifically relate to the fulfillment strategy of producing large volumes of hair care products, which is focused on inventory management rather than control of the supply chain.