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Select and write the correct answer from the given alternatives in each of the following: Let `x, y in R` then x + yi is purely imaginary number if

A

a) x = 0, `y != 0`

B

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

C

c) `x != 0`, `y != 0`

D

d) x = 0, y = 0

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