Shail and Jackwyn work at a restaurant that is open seven days a week. Shail’s schedule is to work three days in a row, and then have one day off. Jackwyn’s schedule is to work five days in a row, and then have two days off. In September, neither Shail nor Jackwyn worked on September 1, but both worked on September 2. What other date in September were both Shail and Jackwyn off on the same day?

Indicate all such dates.

(A) September 13

(B) September 17

(C) September 21

(D) September 29