$\text{ Let }A\text{ be the area between co-ordinate axis, }{y}^2=x-1,x^2=y-1\text{ and the line which makes the }$

$\text{ shortest distance between two parabolas and }{\mathrm{A}}^{\mathrm{\prime }}\text{ be the area between }\mathrm{x}=0,{\mathrm{x}}^2=\mathrm{y}-1,\mathrm{x}=\mathrm{y}\text{ and the }$

$\text{ shortest distance between }{y}^2=x-1\text{ and }{x}^2=y-1\text{, then }$

• A

  $A=A^{\mathrm{\prime }}$

• B

  $A={\left(A^{\mathrm{\prime }}\right)}^{1/2}$

• C

  $\mathrm{A}=2{\mathrm{A}}^{\mathrm{\prime }}$

• D

  $\text{ can't say anything }$