The question asks to identify the correct statements about Real-Time Operating Systems (RTOS).

Analyzing RTOS Characteristics

Let's evaluate each statement:

• A. It permits creation of multiple processes within an application. RTOS typically manage multiple tasks or processes concurrently to handle various system functions efficiently. This statement is correct.
• B. It does not permit priorities to be assigned to processes. This is incorrect. Priority assignment is a fundamental aspect of RTOS, enabling critical tasks to execute before less important ones.
• C. It permits a programmer to define interrupts and interrupt processing routines. RTOS are designed for low-latency responses, which involves directly handling hardware interrupts and allowing programmers to define specific interrupt service routines (ISRs). This statement is correct.
• D. It does not use priority driver or deadline oriented scheduling. This is incorrect. RTOS heavily rely on scheduling algorithms like priority-based preemptive scheduling and deadline-driven scheduling to meet strict timing requirements.
• E. It provides fault tolerance and graceful degradation capabilities. In critical applications, RTOS often incorporate features for fault tolerance (detecting and recovering from errors) and graceful degradation (continuing operation, possibly in a limited mode, upon failure). This statement is correct.

Identifying Correct Statements

Based on the analysis, statements A, C, and E are correct characteristics of a Real-Time Operating System.

Conclusion

The correct option includes statements A, C, and E.