TOC-Regular/CFL

Question

Comments

Option (C)

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Please explain and ans

Answer 1

L1 is regular but L2 is DCFL. So 4th point incorrect.

DCFL with regular closed under intersection(DCFL $\cap$ Regular = DCFL), Union(DCFL $\cup$ Regular= DCFL), concatenation(DCFL .Regular = DCFL)  , minus (Regular - DCFL   = Regular  $\cap$ DCFL' = Regular  $\cap$ DCFL =  DCFL) so all 1,2,3 are DCFL too.

Comments

3 is not concatenation..its minus(-)

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added that also.