Final answer:
True a. Complementing products or services is an important aspect of great customer service as it provides additional value and convenience to the customer.
Step-by-step explanation:
Complementing products or services is indeed an important aspect of great customer service. It refers to offering additional items or services that enhance or complete the customer's main purchase. This can include accessories, related products, or add-on services that provide additional value and convenience to the customer.
A related concept is bundling, where a company sells multiple products or services as a package. This allows customers to acquire multiple items at a better price than if they were purchased individually. Cable companies, for example, often offer bundled packages that include cable, internet, and phone services at a discounted rate.