Regarding timelines, which is NOT true?

a$)$ Timelines for marketing outcomes should involve short$-$term milestones to reach the long$-$term goal.

b$)$ Timelines for marketing outcomes can be both specific and flexible, depending on the outcome.

c$)$ The timeline to lower prices for non$-$seasonal items can be flexible.

d$)$ It is ideal to address timeline deviations at the end of the year, so it can be done in a comprehensive manner.