What is the degree of the differential equation $\left(\frac{d^3 y}{d x^3}\right)^{\frac{2}{3}}+4-3\left(\frac{d^2 y}{d x^2}\right)+5\left(\frac{d y}{d x}\right)=0 ?$

• A

  $3$
• Correct answer
  B

  $2$
• C

  $2 / 3$
• D

  Not defined

Hence, the correct answer is option: 'B'.