Explanation:
Re-engineering:
Option 1: Sometimes the re-engineering downsize.Downsize means "making size smaller".
Option 2: This option is right since "Gradual and systematic" is not followed in "re-engineering".
Option 3: Since it is a redesign, the outcome of the plan sometimes threaten the employees
Option 4 & 5: If the process is successful then the reward is for sure.