The relation R defined on a set A is antisymmetric if $(\mathrm{a}, \mathrm{b})\in \mathrm{R}\Rightarrow (\mathrm{b}, \mathrm{a})\in \mathrm{R}$ for

• A

  Every $(\mathrm{a}, \mathrm{b})\in \mathrm{R}$

• B

  No $(\mathrm{a}, \mathrm{b})\in \mathrm{R}$

• C

  No $(\mathrm{a}, \mathrm{b}), \mathrm{a}\ne \mathrm{b}, \in \mathrm{R}$

• D

  None of these