Why is sensitivity analysis frequently used for artificial neural networks?

a$.$

because it is required by all major artificial neural networks

b$.$

because some consequences of mistakes by the network might be fatal, so justification may matter

c$.$

because it is generally informative, although it cannot help to identify cause$-$and$-$effect relationships among variables

d$.$

because it provides a complete description of the inner workings of the artificial neural network