$X$ is an extensive property and $x$ is an intensive property of a thermodynamic system. Which of the following statement(s) is (are) correct?

• Correct answer
  A

  xX is extensive
• B

  $\frac{x}{X}$ is intensive
• Correct answer
  C

  $\frac{X}{x}$ is extensive
• D

  $\frac{\mathrm{dX}}{\mathrm{dx}}$ is intensive

Hence, the correct answer is options: 'A', 'C'.