Rectangle A′B′C′D′ is a dilation of rectangle ABCD. What is the scale factor? Enter your answer in the box. $\text{Basic}$Basic 789÷Divided by456×Multiplied by123-Minus0.,+PlusLeftRightBackspa ce=Equals $x$x$y$y$x^2$x2$\sqrt{ }$√$\frac{x}{ }$ x $x\frac{ }{ }$x $x^{ }$x$x_{ }$x<>±$%$\degree$°:$\left(\ri ght)$()$\abs{ }$$\pi$π$\infty$∞ Note: Images may not be drawn to scale. Rectangle ABCD is shown. Side AB is labeled 2. Side BC is labeled 4. Rectangle A prime B prime C prime D prime is shown. Side A prime B prime is labeled 8. Side B prime C prime is labeled 16.