l \( x \in \mathbb{R}^d \) and some \( m > 0 \)</label></li>
            </ul>
            <div class="feedback" id="feedback5"></div>
        </div>

        <div class="question">
            <p>Let \( f : \mathbb{R}^d \to \mathbb{R} \) be twice continuously differentiable. Which of the following is equivalent to \( f \) being \( m \)-strongly convex?</p>
            <ul class="options">
                <li><label><input type="radio" name="q6" value="0"> a) \( f(y) \leq f(x) + \nabla f(x)^T(y - x) + \frac