Meaning of the Derivative in Context Practice Test

At month 4, active users are decreasing at 1200 users per month.

Over the first 4 months, users decreased by 1200 total.

At month 4, there are $-1200$ active users.

At month 4, active users decrease at 1200 users per day.

At month 4, months decrease at 1200 months per user.