Answer:
The correct answer is the last option: maintenance phase.
Explanation:
To begin with, the maintenance phase inside a project comprehends the situation in where the managers make changes to the project itself regarding the security of it or also to correct problems that came up during the formation of the project. Moreover, in this stage the managers also have to make changes to improve the system's performance that is involved in the project so that no more mistakes tends to happen along the next weeks. Therefore that during this stage the performance is measured by the managers and schedules are updated regarding the problems.
