If GCD(a,b)=d\text{GCD}(a, b) = dGCD(a,b)=d, which of the following is true?
GCD(ad,bd)=1\text{GCD}(\frac{a}{d}, \frac{b}{d}) = 1GCD(da,db)=1
GCD(a,b)\text{GCD}(a, b)GCD(a,b) divides a+ba+ba+b
GCD(a,b)\text{GCD}(a, b)GCD(a,b) divides a−ba-ba−b
GCD(a,b)≤min(a,b)\text{GCD}(a, b) \le \min(a, b)GCD(a,b)≤min(a,b)