31. Let z=a+i+a−i1, where a is a real number. Which of the following must be true? I. z is a real number. II. If z is a
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31. Let z=a+i+a−i1, where a is a real number. Which of the following must be true? I. z is a real number. II. If z is a
31. Let z=a+i+a−i1, where a is a real number. Which of the following must be true? I. z is a real number. II. If z is a purely imaginary number, then z=2i. III. Imaginary part of z Real part of z is an irrational number. A. I only B. II only C. I and III only D. II and III only
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