Siva contracts to sell to the Marcos University Bookstore 10,000 black USB flash drives. Siva identifies the flash drives by boxing up the order, attaching labels with Marcos’s address to the cartons, and leaving the boxes on the loading dock for shipping. Between Siva and Marcos,

a. the risk of loss has passed with respect to all of the flash drives.

b. the risk of loss has passed with respect to half of the flash drives.

c. the risk of loss has passed with respect to the flash drives with labels on the boxes.

d. none of the above has occurred.