When management researchers talk about developing a management 'model', what do they mean by a 'model'?

a$.$ A set of assumptions about what is happening and why in relation to a social phenomena.

b$.$ None of these explanations is consistent with what management researchers mean by a 'model'.

c$.$ A representation of a more complex reality.

d$.$ All of these explanations are consistent with what management researchers mean by a 'model'.

e$.$ A set of beliefs about what a manager should do$.$