Diketahui P = {x | 6 <= x <= 9, x bilangan asli} dan Q = {x

Diketahui P = {x | 6 <= x <= 9, x bilangan asli} dan Q = {x | 5 < x < 13, x bilangan prima}, maka P u Q adalah ... A. {6, 7, 8, 9, 11} B. {7 , 8, 9, 11, 13} C. {6, 7, 8, 9, 11, 13} D. {6, 7, 7, 8, 9, 11, 13}