Q. 24 Let L1 and L2 be any context-free language and R be any regular language. Then, which of the following is correct ?
I. L1 ∪ L2 is context-free. II. L1' is context-free. III. L1-R is context-free. IV. L1 ∩ L2 context-free.
(A) I, II and IV only
(B) I and III only
(C) II and IV only
(D) I only
Answer: (B)
Explanation: