If GCD(a,b)=1\text{GCD}(a, b) = 1GCD(a,b)=1, which of the following is equivalent to GCD(a+b,a−b)\text{GCD}(a+b, a-b)GCD(a+b,a−b)?
Always 111
Either 111 or 222
Always 222
Always GCD(a,b)\text{GCD}(a, b)GCD(a,b)