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Equilateral triangle $A$ has an area of $12$. If triangle $B$, which is also equilateral, has side length that is double that of triangle $B$, what is the area of triangle $B$?

$ \cfrac{36}{\sqrt3} $

$ 48 $

$ \cfrac{48}{\sqrt{3}} $

$ 36\sqrt{3} $

$ 48\sqrt{3} $