Which of the following is equivalent to xxx in ax+by=GCD(a,b)ax+by = \text{GCD}(a, b)ax+by=GCD(a,b)?
Unique modulo bbb
Unique modulo aaa
Unique modulo bGCD(a,b)\frac{b}{\text{GCD}(a,b)}GCD(a,b)b
Not unique