Final answer:
Blackberry OS is event-driven, supports multitasking, and multithreading.
Step-by-step explanation:
The correct answer is a) Yes. Blackberry OS is indeed event-driven and supports multitasking and multithreading.
Event-driven means that the OS responds to events or user actions, such as touching the screen or pressing a button.
Multitasking refers to the OS's ability to run multiple applications simultaneously, allowing users to switch between them effortlessly. Finally, multithreading means that programs can execute multiple tasks concurrently, which improves efficiency.