Does Starbucks use Arabica or Robusta coffee?

Could you clarify for me, which type of coffee beans does Starbucks typically use in their beverages? Do they primarily utilize Arabica beans, known for their nuanced flavors and smooth textures, or do they opt for Robusta beans, which are often characterized by a stronger, more robust taste and higher caffeine content? I'm curious to know the specifics of Starbucks' coffee bean selection and how it contributes to the overall taste and quality of their drinks.