An electronic device makes a beep after every 45 seconds, another device makes a beep after every 60 seconds and the third device makes a beep after every 72 seconds. They beeped together at 8:30 am. At what time will they beep together at the earliest?

• A. 8:50 am
• B. 8:36 am
• C. 2:30 pm
• D. 4:30 pm