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option D

Wrong, it's option c

No, c is correct. You often see z = x+iy.

No, you use i to denote a complex number.

A, B, and D are correct, so what choices do we have left?

its optionD

\(B\) is the answer. All real numbers are complex, so that \(a+bi\) need not have \(b\ne 0\).

A is true so B must be untrue