Which of these array declarations is not legal? (Choose all that apply)
D, E, F.
Option C uses the variable name as if it were a type.
Options E and F don't specify any size.
Although it is legal to leave out the size for later dimensions of a multidimensional array, the first one is required. Option A declares a legal 2D array.
Option B declares a legal 3D array. Option D declares a legal 2D array.