When a program contains extensive use of event handlers, which of the following is necessary?

When a program contains extensive use of event handlers, which of the following is necessary? Correct Answer Nested functions

Nested functions are those functions in which one function is defined inside another function. Nested functions are common in client-side JavaScript, because of its extensive use of event handlers.

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A pooling method, whereby, handlers with higher than average utilization pay into and handlers with lower than average utilization receives payment from is called _______
(i) Why do we remember May Day? (ii) What significant changes happened due to that event? (iii) How did the event happen? (iv) What can be done in present day as a result of that event ? (v) Mention the moral of that event.