Which of the following Balun changes the shape of the unbalanced transmission line to that of a balanced transmission line?

Which of the following Balun changes the shape of the unbalanced transmission line to that of a balanced transmission line? Correct Answer Tapered Balun

Tapered Balun changes the shape of the unbalanced transmission line to that of a balanced transmission line. Sleeve Balun uses a λ/4 sleeve which is shorted at base electrically and it provides infinite impedance at the top. Infinite Balun uses the current flowing outside the conductor as a part of antenna.
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