Consider the following statements :1. X - rays show transverse wave characteristics 2. X - rays can eject electrons from certain metal surfaces3. X - rays of 0.1 A are harder than X - rays of 0.2 A Which of the statements given above is / are correct ?

• A. 1 only
• B. 1 and 2 only
• C. 2 an 3 only
• D. 1, 2 and 3