Let l,m,n be the direction cosines of a line. Then which of the follo…

\(l^2+m^2+n^2=1\)

\(l^2+m^2+n^2=2\)

\(l^2+m^2+n^2\) can be any natural number

\(l^2+m^2+n^2\) is an irrational number