Let A $=\{1,2,$ d$\}$ and B $=\{2,$ d$,4,$ e$\}.$

Consider the following two relations from A to B:

S $=\{(1,4),(2,2),(2,$ d$),($d$,2),($d$,$ e$)\}$ and

T $=\{($d$,$ d$),($d$,2),(1,$ d$),(2,4),(1,$ e$)\}.$

Which one of the following relations represents T $$ S $($ie S; T$)?$

Select one:

a$.$

$\{($d$,2),($d$,$ e$),($d$,2),($d$,$ d$),(1,2),(1,$ e$)\}$

b$.$

$\{(2,4),(2,$ d$),(2,2),($d$,4)\}$

c$.$

$\{(2,$ d$),(2,2),(2,$ e$),($d$,2),($d$,$ d$)\}$

d$.$

$\{($d$,2),($d$,4),(1,$ d$),(1,2)\}$