If GCD(a,b)=d\text{GCD}(a, b) = dGCD(a,b)=d, which of the following expressions is always equivalent to LCM(a,b)\text{LCM}(a, b)LCM(a,b)?
a+b−da + b - da+b−d
a⋅bd\frac{a \cdot b}{d}da⋅b
a⋅db\frac{a \cdot d}{b}ba⋅d
a⋅b⋅da \cdot b \cdot da⋅b⋅d