In the ring of integers of the quadratic field $\mathbb{Q}(\sqrt{2})$, the norm of an element $a + b\sqrt{2}$ is defined as $N(a + b\sqrt{2}) = a^2 - 2b^2$. Which of the following is an integer solution $(a, b)$ to the norm equation $a^2 - 2b^2 = 7$? (Select all that apply)