According to NR-35.1.2, what is considered work at height? a) Any activity performed above 2 meters from the lower level, where there is a risk of...

According to NR-35.1.2, what is considered work at height?

a) Any activity performed above 2 meters from the lower level, where there is a risk of falling.
b) Any activity performed above 3 meters from the lower level, where there is a risk of falling.
c) Any activity performed above 4 meters from the lower level, where there is a risk of falling.
d) Any activity performed above 5 meters from the lower level, where there is a risk of falling.