Given x = {a, b, c, d, . . . . . ,z}, Y = {a, e, i, o, u}, Z = {e, d, u, a, c, t, i, n, o}, which of the following are true? There may be more than one correct answer.
A. Y⊂X
B. Y⊂Z
C. Z ⊂ X
D. X ⊂ Y