Q 2106412378.     The distance between two points `P` and `Q` is d and the
length of their projections of `PQ` on the coordinate planes
are `d_1, d_2, d_3`. Then `d_(1)^2 + d_(2)^2 + d_(3)^2 = kd^2`
, where `k` is

A

`1`

B

`5`

C

`3`

D

`2`

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