While calculating h2 with reference to h1, line of sight must be ______ m above the point of tangency.

While calculating h2 with reference to h1, line of sight must be ____

1.	While calculating h2 with reference to h1, line of sight must be ______ m above the point of tangency.
A.	5-6 m
B.	4-5 m
C.	3-4 m
D.	2-3 m
Answer» E.