When calculating the results, what is the expected $\%$ retained and passing for the pan placed at the bottom of the sieves?

$\%$ retained $=40\%$ and $\%$ passing $=60\%$

$\%$ retained $=50\%$ and $\%$ passing $=50\%$

$\%$ retained $=0\%$ and $\%$ passing $=100\%$

$\%$ retained $=100\%$ and $\%$ passing $=0\%$