Let be any two context free languages and R be any regu

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Let be any two context free languages and R be any regular language. Then which of the following is/are CORRECT?
I. is context – free
II. is context – free
III. is context – free
IV. is context – free

[GATE CS 2017 Set 2]

A I, II and IV only

B I and III only

C II and IV only

D I only