Let $G$ and $L$ be relations on $A=\{1,a,b,2\}$ with $G=\{(1,a),(1,b),(a,2),(2,1)\}$ and $L=\{(b,2),(1,1),(a,b)\}.$

Which one of the following alternatives represents the relation $L$@$G=G$;$L?$

Select one:

a$.\{(a,2)\}$

b$.\{(1,b),(1,2),(2,1)\}$

c$.\{(1,2),(a,1),(2,a),(2,b)\}$

d$.\{(b,1),(1,a),(1,b)\}$