Where all "the following" i can help you but you said which of the folllowing and ther no picture or anything?
Answer:
Simply put: A callback is a function that is to be executed after another function has finished executing — hence the name 'call back'. ... Functions that do this are called higher-order functions. Any function that is passed as an argument is called a callback function.
Explanation:
The software development model that focuses on improving the product in small steps each time through the cycle is the Waterfall Process model
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The Waterfall Process model mainly focuses on going step by step to make sure the product improves sufficiently and significantly.
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- Marlon Nunez