The number of real roots of the equation, $\mathrm{e}^{4 \mathrm{x}}+\mathrm{e}^{3 \mathrm{x}}-4 \mathrm{e}^{2 \mathrm{x}}+\mathrm{e}^{\mathrm{x}}+1=0$ is 

  • [JEE MAIN 2020]
  • A

    $4$

  • B

    $2$

  • C

    $3$

  • D

    $1$

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