Which of the following is true?

Options

A. `A={1,7,6}` and `B={7,2,1}` then `1,2,7 in A`.
B. `A={a,b,c}` and `B={b,c,d}` then `a,b,c in B`.
C. `A={a,e,i,o,u}` and `B={a,b,c,d,….,x,y,z}` then `a,e,i,o,u in B`,
D. `A={1,2,1,2}` and `B={a,b,c}` then, `1,2 in B`

Answer

C