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Q.) Let us define the length of a vector a i + b j + c k as |a| + |b| + |c|. This definition coincides with the usual definition of length of a vector a i + b j + c k if and only if
[A]
a = b = c = 0
[B]
any two of a, b and c are zero
[C]
any one of a, b and c is zero
[D]
a + b + c = 0
[A] a = b = c = 0
[B] any two of a, b and c are zero
[C] any one of a, b and c is zero
[D] a + b + c = 0
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