<li><label><input type="radio" name="q4" value="3"> d) \( \nabla^2 f(x_0) \succ 0 \)</label></li>
            </ul>
            <div class="feedback" id="feedback4"></div>
        </div>

        <div class="question">
            <p>A function \( f : \mathbb{R}^d \to \mathbb{R} \) is \( m \)-strongly convex if:</p>
            <ul class="options">
                <li><label><input type="radio" name="q5" value="0"> a) \( \nabla^2 f(x) \succeq mI_{d \times d} \), for all \( x \in \mathbb{R}^d \) and some \( 