When selecting hotel rooms, you need to maximize safety and security. Select a room located between the （） and （） floor.

When selecting hotel rooms, you need to maximize safety and security. Select a room located between the （） and （） floor.
A.2nd; 4th
B.3rd; 5th
C.4th; 6th
D.6th; 8th
正确答案：4th; 6th