What is the most logical next event?

A second bowl is shown with ingredients added and then mixed. The second bowl is mixed into the first bowl. The mixture is covered by plastic wrap. the oven

Select from:
1). is turned off and a robot begins to touch the cake..
2). is empty then it is shown with a note on it that says " top use usa today, only 10 minutes left "..
3). is shown being turned on..
4). timer begins to do its countdown in a cabinet..
3).