Process synchronization can be done on:

Process synchronization, which ensures that multiple processes or threads access shared resources without conflicts, can be done on Both hardware and software levels. This is crucial in operating systems to prevent race conditions and maintain data consistency. Hardware-level support includes specialized CPU instructions (e.g., TestAndSet, CompareAndSwap) that provide atomic operations, ensuring that a sequence of operations completes without interruption.

• Software-level (B) mechanisms, such as semaphores, mutexes, and monitors, are programming constructs that allow developers to control access to critical sections of code. These software solutions often rely on underlying hardware support for their atomic primitives or are implemented entirely in software.
• Therefore, stating only Hardware level (A) or only Software level (B) is incomplete, as a robust synchronization strategy typically involves a combination of both.
• None of these (D) is incorrect.