What are the factors in selecting the depth of neural networks?

$$Type of neural network $($eg$.$ MLP$,$ CNN$,$ etc$)$

$$Input data

$$Computation power, i$.$e$.$ Hardware capabilities and software capabilities

$$Learning Rate

$$The output function to map

$$a$.2,3,4,5$

$$b$.1,3,4,5$

$.1,2,4,5$

$$d$.$ All of these