Which of the expressions correctly is an requirement of the pumping lemma for the context free languages?

Which of the expressions correctly is an requirement of the pumping le

1.	Which of the expressions correctly is an requirement of the pumping lemma for the context free languages?
A.	uv<sup>n</sup>wx<sup>n</sup>y
B.	uv<sup>n</sup>w<sup>n</sup>x<sup>n</sup>y
C.	uv<sup>2n</sup>wx<sup>2n</sup>y
D.	All of the mentioned
Answer» C. uv<sup>2n</sup>wx<sup>2n</sup>y