Which of these is always true?
GCD(a,b)≤LCM(a,b)\text{GCD}(a, b) \leq \text{LCM}(a, b)GCD(a,b)≤LCM(a,b)
GCD(a,b)≤a\text{GCD}(a, b) \leq aGCD(a,b)≤a
LCM(a,b)≥a\text{LCM}(a, b) \geq aLCM(a,b)≥a
LCM(a,b)=a+b\text{LCM}(a, b) = a+bLCM(a,b)=a+b