Let U $=\{$a$,$ b$,$ c$,$ d$,$ e$\}.$

Let A $=\{$a$,$ b$,$ c$\},$ B $=\{$b$,$ c$,$ d$,$ e$\}$ and C $=\{$a$,$ b$,$ e$\}.$

Which one of the following relations on A is antisymmetric?

Select one:

a$.$

$\{($c$,$ c$),($a$,$ c$),($c$,$ b$)\}$

b$.$

$\{($a$,$ c$),($b$,$ c$),($c$,$ b$),($a$,$ b$)\}$

c$.$

$\{($a$,$ a$),($b$,$ a$),($c$,$ b$),($a$,$ b$)\}$

d$.$

$\{($a$,$ c$),($a$,$ b$),($c$,$ a$)\}$