If \[l\,\mathbf{a}+m\,\mathbf{b}+n\,\mathbf{c}=\mathbf{0},\] where \[l,\,m,\,\,n\] are scalars and a, b, c are mutually perpendicular vectors, then

\[l\ne 0,\,\,m\ne 0,\,\,n\ne 0\]

If \[l\,\mathbf{a}+m\,\mathbf{b}+n\,\mathbf{c}=\mathbf{0},\] where \[l

1.	If \[l\,\mathbf{a}+m\,\mathbf{b}+n\,\mathbf{c}=\mathbf{0},\] where \[l,\,m,\,\,n\] are scalars and a, b, c are mutually perpendicular vectors, then
A.	\[l=m=n=1\]
B.	\[l+m+n=1\]
C.	\[l=m=n=0\]
D.	\[l\ne 0,\,\,m\ne 0,\,\,n\ne 0\]
Answer» D. \[l\ne 0,\,\,m\ne 0,\,\,n\ne 0\]

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If \[l\,\mathbf{a}+m\,\mathbf{b}+n\,\mathbf{c}=\mathbf{0},\] where \[l,\,m,\,\,n\] are scalars and a, b, c are mutually perpendicular vectors, then

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