<p><b>2. The correct answer is C.</b><br /> Option A is false. <code>Collection</code>s use the <code>parallelStream()</code> method.<br /> Option B is false. Operations that are computationally expensive, generally have a better performance using a parallel stream.<br /> Option C is true. <code>filter()</code> is considered stateless.<br /> Option D is false. Parallel streams don't always perform better than sequential streams.</p>

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            <p><b>3. The correct answer is A.</