Consider alphabet ∑ = {0, 1}, the null/empty string λ and the sets of strings X0, X1 and X2 generated by the corresponding non-terminals of a regular grammar. X0, X1 and X2 are related as follows: X0 = 1 X1 X1 = 0 X1 + 1 X2 X2 = 0 X1 + {λ} Which one of the following choices precisely represents the strings in X0?

Consider alphabet ∑ = {0, 1}, the null/empty string λ and the sets

1.	Consider alphabet ∑ = {0, 1}, the null/empty string λ and the sets of strings X0, X1 and X2 generated by the corresponding non-terminals of a regular grammar. X0, X1 and X2 are related as follows: X0 = 1 X1 X1 = 0 X1 + 1 X2 X2 = 0 X1 + {λ} Which one of the following choices precisely represents the strings in X0?
A.	10 (0* + (10)*)1
B.	10 (0* + (10))1
C.	1(0* + 10)*1
D.	10 (0 + 10)1 + 110 (0 + 10)1
Answer» D. 10 (0 + 10)1 + 110 (0 + 10)1

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