10. In 2020, Juergen made after-tax contributions of $24,300 to his employer's qualified plan. In August 2021, he requested a nonperiodic distribution. At that time, his account balance was $78,000 and he received a one-time distribution of $13,000. How much of the distribution is tax-free?

a. $0

b. $4,050

c. $11,300

d. $13,000