What mathematical formula is used to validate an ABA routing number?
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A
3(d1+d4+d7) + 7(d2+d5+d8) + 1(d3+d6+d9) must be divisible by 10
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B
The sum of all nine digits must equal 100
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C
Each digit must be less than 5 and the total must be even
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D
The product of alternate digits must equal the remaining digits