a and b are positive integers less than or equal to 6. If a and b are assembled into the six-digit number ababab, which of the following must be a factor of ababab?	Choose the correct option.
A) 3 B) 4 C) 5 D) 2 E) none of the above
242424 when divided by 2 gives the result 121212   CONCEPT: Rule of Divisibility of 2 isIf sum of the digits of the Number is divisible by 2 then the number will be divisible by 2   SUm of the digits of No. which is divisible by 2 hence the Number 242424 will be divisible by 2   2
<result>D</result>
a and b are positive integers less than or equal to 6. If a and b are assembled into the six-digit number ababab, which of the following must be a factor of ababab?