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Answer: Option 4
These features are at the heart of jQuery’s power and utility: 1. An expressive syntax (CSS selectors) for referring to elements in the document 2. An efficient query method for finding the set of document elements that match a CSS selector 3. A useful set of methods for manipulating selected elements 4. Powerful functional programming techniques for operating on sets of elements as a group, rather than one at a time 5. A succinct idiom (method chaining) for expressing sequences of operations.
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