Which of the following is a difference between programmed decisions and nonprogrammed decisions?

a$.$ Unlike nonprogrammed decisions, programmed decisions are made in response to situations that are unique and largely unstructured.

b$.$ Unlike programmed decisions, nonprogrammed decisions concern the maintenance of a regular supply of raw materials.

c$.$ Unlike nonprogrammed decisions, programmed decisions are made in response to recurring organizational problems.

d$.$ Unlike programmed decisions, nonprogrammed decisions concern the types of skills required to fill certain jobs.