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What is the <apex:actionSupport> tag used for in Visualforce pages?

1. To provide help and support content for buttons and links.

2. To trigger a second action when a button or link is clicked.

3. To trigger controller actions in response to DOM element events.

4. To create a Javascript function that can trigger a controller action.

Discussion: It belongs inside the component, so it its an element of the component.

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