1. Hillary wanted to donate a doughnut to Levi, so she sent him a message on Facebook, stating that she is giving her doughnut to Levi. After one hour, Levi has not yet responded to Hillary's message. Already growing impatient, Hillary instead gave the doughnut to Mark.

Levi claims that the doughnut should belong to him, since Hillary donated the doughnut as early as an hour ago.

Question:

1. When is donation perfected?

2. In this case, who is the owner of the doughnut? Why? Explain.