Select all that apply

Consider a function G that maps students in a class to grades. The domain is the set of students in the class: $\{$Yu$,$ Kirstein, Alshahrani, Yarra, Mitchell, Feldman$\}.$The codomain is the set of grades: $\{$A$,$ B$,$ C$,$ D$,$ E$,$ F$\}.$ Select all of the functions below that are bijections.

Multiple select question.

G$($Yu$)=$ A$,$ G$($Kirstein$)=$ A$,$ G$($Alshahrani$)=$ A$,$ G$($Yarra$)=$ A$,$ G$($Mitchell$)=$ A$,$ G$($Feldman$)=$ A

G$($Yu$)=$ A$,$ G$($Kirstein$)=$ B$,$ G$($Alshahrani$)=$ C$,$ G$($Yarra$)=$ D$,$ G$($Mitchell$)=$ E$,$ G$($Feldman$)=$ F

G$($Yu$)=$ F$,$ G$($Kirstein$)=$ E$,$ G$($Alshahrani$)=$ D$,$ G$($Yarra$)=$ C$,$ G$($Mitchell$)=$ B$,$ G$($Feldman$)=$ A

G$($Yu$)=$ A$,$ G$($Kirstein$)=$ B$,$ G$($Alshahrani$)=$ A$,$ G$($Yarra$)=$ B$,$ G$($Mitchell$)=$ B$,$ G$($Feldman$)=$ F