Read this and answer the question. If the question is unanswerable, say "unanswerable".

In May 2005, Carrie Underwood was announced the winner, with Bice the runner-up. Both Underwood and Bice released the coronation song "Inside Your Heaven". Underwood has since sold 65 million records worldwide, and become the most successful Idol contestant in the U.S., selling over 14 million albums copies in the U.S. and has more  Underwood has won seven Grammy Awards, the most Grammys by an "American Idol" alumnus.

Which American Idol contestant has won the biggest number of Grammy Awards?
Carrie Underwood