Let \( K_n \) denote the complete graph with \( n \) vertices. Which of the following is true?

**I.** \(\hspace{1mm} K_4 \) is planar.

**II.** \(\hspace{1mm} K_5 \) is planar.

**III.** \(\hspace{1mm} K_6 \) is planar.

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