For two vectors 𝐀 and 𝐁,|𝐀+𝐁|=|𝐀-𝐁| is always true, when (a) |𝐀|=|𝐁| ≠ 0 (b) |𝐀|=|𝐁| ≠ ...

For two vectors 𝐀 and 𝐁,|𝐀+𝐁|=|𝐀-𝐁| is always true, when
(a) |𝐀|=|𝐁| ≠ 0
(b) |𝐀|=|𝐁| ≠ 0 and 𝐀 and 𝐁 are parallel or anti-parallel
(c) when either |𝐀| or |𝐁| is zero
(d) None of the above

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