Let $\mathrm{X}=\left\{1, 2, 3, 4, 5\right\} \mathrm{and} \mathrm{Y}=\left\{1, 3, 5, 7, 9\right\}.$ Which of the followingis not  relations from X to Y

• A

  ${\mathrm{R}}_1=\left\{\left(\mathrm{x},\mathrm{y}\right)|\mathrm{y}=2+\mathrm{x}, \mathrm{x}\in \mathrm{X}, \mathrm{y}\in \mathrm{Y}\right\}$

• B

  ${\mathrm{R}}_2=\left\{(1, 1), (2, 1), (3, 3), (4, 3), (5, 5)\right\}$

• C

  ${\mathrm{R}}_3=\left\{\left(1,1\right), \left(1, 3\right), (3, 5), (3,7), (5,7)\right\}$

• D

  ${\mathrm{R}}_4=\left\{(1, 3), \left(2, 5\right), (2, 4), (7, 9)\right\}$