It approximates the Binomial distribution with $\lambda = 500 imes 0.02 = 10$.

It follows a continuous distribution with $\lambda = 0.02 / 500 = 0.00004$.

It is an exact model for any $n > 30$ with $\lambda = 0.02$.

The variance equals the mean, and $\lambda = 500 + 0.02 = 500.02$.