The length of the longest rod that can fit in a cubical room of 4 m side is?	Choose the correct option:
A) 6.978 m	B) 6.928 m	C) 6.829 m	D) 6.248 m	E) 6.982 m
The length of the longest rod=4 sq.root of 3=6.928 m   Answer: 6.928 m
<result>B</result>
The length of the longest rod that can fit in a cubical room of 4 m side is?