Six persons A,B,C,D,E and G are living in a seven-storey building, where on of the floor is vacant but not necessarily in the same order. The lowermost floor of the building is numbered 1, the floor above it is numbered 2, and so on till the topmost floor is numbered 7. A stays two floors above G who lives on an odd prime numbered floor. B stays two floor below E, who does not stay at the topmost floor. An even numbered floor is vacant. C is living above E and G but below A. Who is living immediate above the vacant floor?