What happens during the execution of an OO application?

A.
A portion of the object model will be in memory, with requests “traversing” the model.

B.
The last set of running objects is brought into memory.

C.
The business model, as drawn on class diagrams, will be in memory upon startup.

D.
Model objects are instantiated from the database as needed to support the current view
objects, and then discarded.