The rock reinforcement systems are used:

in making of cofferdams

for constructing bridges on long rivers

while casting foundations for high rise buildings

to add additional stability to rock tunnels in which structural defects exist in the rock

Solution

Correct option is A

Rock Reinforcement:
The rock reinforcement systems to stabilize tunnels, surface, underground mines, and mine roadways intersections are designed using Factor of Safety (FoS), which is a ratio of the reinforcement resistance to the roof rock-load of overlying immediate strata.