Regarding the function CONS in Schema. Indicate what is true

a$)($CONS $\text{'}()\text{'}($A B$))$ returns $(()$ A B$)$

b$)($CONS $\text{'}$A $\text{'}())$ returns $(\text{'}$A$)$

c$)($CONS $\text{'}$A $\text{'}($B C$))$ returns $(\text{'}$A $\text{'}($B C$))$

d$)($CONS $\text{'}($A B$)\text{'}($C D$))$ returns $(($A B$)$ C D$)$