Let $z$ be complex number such that $\left|\frac{z-i}{z+2 i}\right|=1$ and $|z|=\frac{5}{2} \cdot$ Then the value of $|z+3 i|$ is 

  • [JEE MAIN 2020]
  • A

    $\sqrt{10}$

  • B

    $2 \sqrt{3}$

  • C

    $\frac{7}{2}$

  • D

    $\frac{15}{4}$

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