Final answer:
Perfective and adaptive maintenance involve revisions, enhancements, bug fixes, and performance improvements.
Step-by-step explanation:
Perfective and adaptive maintenance are two types of software maintenance that focus on improving and enhancing existing software. The results of perfective maintenance include revisions, enhancements, and performance improvements.
Revisions refer to changes made to the software to fix bugs or improve its functionality. Enhancements, on the other hand, involve adding new features or improving existing ones.
Performance improvements aim to optimize the software's performance, making it faster and more efficient. These can include optimizations to algorithms, database queries, or resource management.