Consider the following method.

A $9-$line code segment reads as follows:

Line $1$: public Array List, open angular bracket, Integer, close angular bracket, mystery, open parenthesis, int n$,$ close parenthesis.

Line $2$: open brace.

Line $3$: Array List, open angular bracket, Integer, close angular bracket, seq equals new Array List, open angular bracket, Integer, close angular bracket, open parenthesis, close parenthesis, semicolon.

Line $4$: blank.

Line $5$: for, open parenthesis, int k equals $1,$ semicolon, k less than or equal to n$,$ semicolon, k$,$ plus, plus, close parenthesis.

Line $6$: seq, dot, add, open parenthesis, new Integer, open parenthesis, k$,$ multiplication asterisk, k$,$ plus, $3,$ close parenthesis, close parenthesis, semicolon.

Line $7$: blank.

Line $8$: return seq, semicolon.

Line $9$: close brace.

Which of the following is printed as a result of executing the following statement?

System.out.println$($mystery $(6))$ ;