Which of the following is not true? a. in order for a+bi to be a complex number, b must be nonzero

A+bi is a complex number, where a is the real part and bi is the complex part

A. true, if x is a real number then x+bi where b=0 is a complex number

B. true, as from the above statement

C. nope, it is usually a+bi

D. correct

the incorrect option is C