Consider the following types of languages: L1 Regular, L2: Context-free, L3: Recursive, L4: Recursively enumerable. Which of the following is/are TRUE? I. L3' U L4 is recursively enumerable II. L2 U L3 is recursive III. L1* U L2 is context-free IV. L1 U L2' is context-free

Consider the following types of languages: L1 Regular, L2: Conte

1.	Consider the following types of languages: L1 Regular, L2: Context-free, L3: Recursive, L4: Recursively enumerable. Which of the following is/are TRUE? I. L3' U L4 is recursively enumerable II. L2 U L3 is recursive III. L1* U L2 is context-free IV. L1 U L2' is context-free
A.	I only
B.	I and III only
C.	I and IV only
D.	I, II and III only
Answer» E.

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Consider the following types of languages: L1 Regular, L2: Context-free, L3: Recursive, L4: Recursively enumerable. Which of the following is/are TRUE? I. L3' U L4 is recursively enumerable II. L2 U L3 is recursive III. L1* U L2 is context-free IV. L1 U L2' is context-free

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Consider the following types of languages:

L1 Regular, L2: Context-free, L3: Recursive, L4: Recursively enumerable.

Which of the following is/are TRUE?

I. L3' U L4 is recursively enumerable II. L2 U L3 is recursive III. L1* U L2 is context-free IV. L1 U L2' is context-free