In how many ways can 15 people be seated around two round tables with seating capacities of 7 and 8 people?
A. 15! × 8!
B. 7! × 8!
C. ¹⁵C₇ × 6! × 7!
D. 2 × ¹⁵C₇ × 6! × 7!
E. ¹⁵C₈ × 8!