Consider the following code segment, which is intended to display "cat".

String$[][]$ keyboard $=\{\{"$q$","$w$","$e$","$r$","$t$"\},$

$\{"$a$","$s$","$d$","$f$","$g$"\},$

$\{"$z$","$x$","$c$","$v$","$b$"\}\}$;

System.out.println$(/*$ missing expression $*/)$;

Which of the following can replace $/*$ missing expression $*/$ so that the code segment works as intended?