If gcd(a,b)=1\text{gcd}(a, b) = 1gcd(a,b)=1, what is gcd(a+b,a2+b2)\text{gcd}(a+b, a^2+b^2)gcd(a+b,a2+b2)?
1 or 2
1 or 4
Always 1
Always 2