abel><input type="radio" name="q7" value="0"> a) \( (\mathrm{proj}_D(x) - x)^T(y - \mathrm{proj}_D(x)) \leq 0 \), for all \( y \in D \)</label></li>
                <li><label><input type="radio" name="q7" value="1"> b) \( (\mathrm{proj}_D(x) - x)^T(y - \mathrm{proj}_D(x)) = 0 \), for all \( y \in D \)</label></li>
                <li><label><input type="radio" name="q7" value="2"> c) \( (\mathrm{proj}_D(x) - x)^T(y - \mathrm{proj}_D(x)) \geq 0 \), for all \( y \in D \)</label></li>
                <li><lab