Which one of the operations of n-p-n transistor differs from that of p-n-p transistor?

Options

1. AThe emitter-base junction is reversed biased in n - p - n transistor.
2. BThe emitter injects minority carriers into the base region of the p-n-p transistor.
3. CThe emitter injects holes into the base of the p - n - p transistor and electrons into the base region of n-p-
4. DThe emitter injects holes into the base of n - p - n transistor.