If GCD(a,b)=d\text{GCD}(a, b) = dGCD(a,b)=d, which of the following is always true?
GCD(a+d,b+d)=d\text{GCD}(a+d, b+d) = dGCD(a+d,b+d)=d
GCD(a/d,b/d)=1\text{GCD}(a/d, b/d) = 1GCD(a/d,b/d)=1
LCM(a,b)=a⋅b/d\text{LCM}(a, b) = a \cdot b / dLCM(a,b)=a⋅b/d
GCD(a2,b2)=d2\text{GCD}(a^2, b^2) = d^2GCD(a2,b2)=d2