Which of the following activities BEST represents the main concerns of maintenance testing?
I. Patches to correct newly-exposed vulnerabilities.
II. Review of system architecture.
III. Migration to a new operating system.
IV. Database upgrade to the latest version.
V. Pre-release changes to system requirements.
A . III, IV, V
B . I, II, V
C . II, III, IV
D . I, III, IV
Answer: D