In case of bridge greater than 10.7m in height and which cannot be inspected from beneath due to watery situation the instrument suited for inspection work is?

In case of bridge greater than 10.7m in height and which cannot be in

1.	In case of bridge greater than 10.7m in height and which cannot be inspected from beneath due to watery situation the instrument suited for inspection work is?
A.	Electrical resistance meter
B.	Strain gauges
C.	Barins snooper vehicle
D.	Rain guages
Answer» D. Rain guages