For any two languages L1 and L2 such that L1 is context free and L2 is recursively enumerable but not recursive, which of the following is/are necessarily true? 1. L1' (complement of L1) is recursive 2. L2' (complement of L2) is recursive 3. L1' is context-free 4. L1' ∪ L2 is recursively enumerable

For any two languages L1 and L2 such that L1 is context free and L2 is

1.	For any two languages L1 and L2 such that L1 is context free and L2 is recursively enumerable but not recursive, which of the following is/are necessarily true? 1. L1' (complement of L1) is recursive 2. L2' (complement of L2) is recursive 3. L1' is context-free 4. L1' ∪ L2 is recursively enumerable
A.	1 only
B.	3 only
C.	3 and 4 only
D.	1 and 4 only
Answer» E.

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