Q. Consider the languages
L1={0^{i}1^{j}|i != j},
L2={0^{i}1^{j}|i = j},
L3 = {0^{i}1^{j}|i = 2j+1},
L4 = {0^{i}1^{j}|i != 2j}.
Which one of the following statements is true?

• (A) Only L2 is context free
• (B) Only L2 and L3 are context free
• (C) Only L1 and L2 are context free
• (D) All are context free