Which property allows us to calculate ddx[3x2+7x]\frac{d}{dx} [3x^2 + 7x]dxd[3x2+7x] as ddx[3x2]+ddx[7x]\frac{d}{dx}[3x^2] + \frac{d}{dx}[7x]dxd[3x2]+dxd[7x]?
Product Rule
Chain Rule
Sum Rule
Quotient Rule