Three electronic devices make a beep after every 48 seconds, 72 seconds and 108 seconds respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

• A. 10 : 07 : 12 hours
• B. 10 : 07 : 24 hours
• C. 10 : 07 : 36 hours
• D. 10 : 07 : 48 hours