C. java List numbers = Arrays.asList(10, 5, 20, 1); int max = numbers.stream().reduce(Integer::max).get(); Here's why the other options are incorrect: (a): filter and findFirst are for filtering and finding the first element that meets a condition. They don't perform reduction to get the maximum value. (b): max with Integer::compareTo uses a comparator to find the maximum element based on comparison. However, it doesn't perform a reduction operation. It returns an Optional containing the maximum value. (d): This code snippet uses max but retrieves the result as an Optional. For reduction operations, you typically call get on the Optional to extract the actual value. Explanation of the correct option (c): List numbers = Arrays.asList(10, 5, 20, 1);: This line assumes you have a list of integers. numbers.stream(): This converts the List to a Stream. .reduce(Integer::max): This part uses the reduce method with Integer::max as the binary operator. reduce performs a reduction operation by applying the binary operator (Integer::max in this case) to each element of the stream and an initial value (which is optional here). Integer::max is a method reference 63/97 that compares two integers and returns the larger one. Since no initial value is provided, the first element of the stream becomes the initial value for comparison. The result of reduce is the maximum value found after comparing all elements. .get(): This calls the get method on the result (which is an Optional in this case) to extract the actual maximum value.
