The HP Partner Portal is designed specifically for partners to access detailed information about various HP specializations, including the Retail & Hospitality Solutions specialization. This portal provides comprehensive resources, training, and certification information, which is essential for partners looking to specialize in specific HP solutions. The other options like HP Asset Hub, HP Sales Hub, and HP Product Catalog are valuable resources but do not specifically focus on specialization information in the way the HP Partner Portal does. This information can be verified through the official HP Partner Portal documentation and partner support services.