Triangle PQR with vertices P(3, −6), Q(6, −9), and R(−15, 3) is dilated by a scale factor of 3 to obtain triangle P′Q′R′. Which statement best describes triangle P′Q′R′?

It is similar to triangle PQR and has coordinates P′(1, −2), Q′(2, −3), and R′(−5, 1).
It is congruent to triangle PQR and has coordinates P′(1, −2), Q′(2, −3), and R′(−5, 1).
It is similar to triangle PQR and has coordinates P′(9, −18), Q′(18, −27), and R′(−45, 9).
It is congruent to triangle PQR and has coordinates P′(9, −18), Q′(18, −27), and R′(−45, 9).