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When a program is executed, the ____ interacted by sending a message to one another

2. When a program is executed, the ____ interacted by sending a message to one another.

1. Objects
2. Classes
3. Operating system
4. Memory

Answer: A) Objects

Explanation:

When a program is executed, the objects interact by sending a message to one another. For example, if "customer" and "account" are two objects in a program, then the customer object may send a message to the account object requesting the back balance.