Consider the following logic program.

previous $(1,0).$

previous$(2,1).$

$ck(x)$ :$-,$ not previous $(Y,O).$

skip $(x)$ :$-ck(x),$ not select $(x).$

select $(x)$ :$-ck(x),$ not skip$($X$).$

Which of the following atoms is in some stable model of this program?

pick$(2)$

select$(1)$

pick$(1)$

select$(2)$

skip$(1)$