Cora has two qualifying children for the Child and Dependent Care Credit, Keri (5) and Jason (9). Cora paid $13,000 for Keri's care, but Jason stayed at a friend's house, so there were no expenses for him. Assuming all other tests are met, how much expense can Cora use to calculate her credit?

$3,000

$6,500

$8,000

$13,000