Mert, who performs operations with radical numbers, instead of multiplying the number $\sqrt{10} + \sqrt{6}$ by its conjugate $\sqrt{10} - \sqrt{6}$, mistakenly divided it.
Accordingly, how much greater is the number Mert found than the number he should have found?
A) $\sqrt{12}$
B) $\sqrt{15}$
C) $\sqrt{18}$
D) $\sqrt{20}$
E) $\sqrt{30}$