Which is true about Flex?
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Breaks free of link and page metaphor
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Slow page refresh
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Progressively loading content
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None of the Above
Flex breaks free of the traditional web's link-and-page metaphor by enabling single-page applications with dynamic content without full page refreshes. It does NOT have slow page refreshes (that's traditional web) or progressively loading content (that's progressive enhancement). Option A correctly describes Flex's architectural advantage.
Flex applications run as a single loaded SWF that manages its own view states, so navigation happens without full page reloads or the traditional hyperlink/page-navigation model used by classic web apps. This is a defining trait of Rich Internet Applications, in contrast to slow page refreshes typical of older web pages.