Consider the following statements:
The SIM instruction outputs the contents of accumulator to define:
1. Interrupt mask bit.
2. Interrupt pending bit.
3. Serial input data line.
4. Serial output data line.
Which of the statements given above are correct?

A. 1 and 2

B. 2 and 3

C. 3 and 4

D. 1 and 4

Answer: Option D