Let x,y ∈ R, then x+iy is a purely imagi...

Let x,y ∈ R, then `x+iy` is a purely imaginary number if

A

a)`x = 0`,` yne 0`

B

b)`x ne 0`,`y = 0`

C

c)`x ne 0`, `y ne 0`

D

d)`x =0`, `y = 0`

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