Which of the following is NOT a product line offered?

The correct choice indicates that "Ruby" is not a product line offered by Palm Beach Tan. Palm Beach Tan focuses on specific product lines designed to enhance the tanning experience, including skincare and tanning solutions, and "Ruby" does not fit within their established offerings.

The other product lines mentioned—Scarlet, Emerald, and Australian Gold—are recognized as part of Palm Beach Tan's inventory, providing a range of options tailored to different skin types and tanning preferences. For instance, Australian Gold is well-known within the tanning community for its bronzers and aftercare products. This indicates that the company has thoughtfully curated its product lines to meet customer needs, and "Ruby" does not align with that strategy, highlighting its absence on the list.