CALCULATION: The unit place will be 0 and the number is also divisible by 21. Option (1) ⇒ Unit place is 5, so, it is not possible. Option (2) ⇒ Unit place is 5, so, it is also not possible. Option (3) ⇒ Unit place is 0, but the given number is not divisible by 21. Option (4) ⇒ Unit place is 0 and the given number is also divisible by 21. So, 11,130 is divisible by 3, 7, and 10.