In the GPON system, Huawei recommends not to use the splitting above level 2. Which of the following networking is wrong?

In the GPON system, Huawei recommends not to use the splitting above level 2. Which of the following networking is wrong?
A . First-order splitting 1:2, second-order splitting 1:8
B . First-order splitting 1:8, second-order splitting 1:8
C . First-order splitting 1:16, second-order splitting 1:16
D . First-order splitting 1:2, second-order splitting 1:16

Answer: C