A sales representative's existing customer is opening offices in new regions.

Expansion target is the best answer because it refers to the opportunity to sell more products or services to an existing customer who isgrowing their business or entering new markets. The sales rep should focus on understanding the customer’s needs and goals in the new regions, and offer solutions that can help them achieve them. Efficiency target and growth target are not relevant to thisscenario, because they are related to the sales rep’s own performance and objectives, not the customer’s. Efficiency target is about improving the sales rep’s productivity and effectiveness, while growth target is about acquiring new customers or increasing market share. References: Certification - Sales Representative - Trailhead, [Sales Rep Training: Prepare Your Team to Sell Successfully - Trailhead]