[单选] 

26、下列数组声明正确的是（   ）。

n=6 : Dim a (1 to n) as integer

Dim a(10) as integer : ReDim a(1 to 12)

Dim a() as single : ReDim a(3,6) as integer

Dim a() as integer : n=6 : ReDim a(1 to n) as integer