Which of the following are incorrect options?

1.	Which of the following are incorrect options?
A.	Informally, problem is a yes/no question about an infinite set of possible instances
B.	Formally, a problem is a language
C.	Both (a) and (b)
D.	None of the mentioned
Answer» E.

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STATEMENT:_IF_L_ID_R.E.,_LC_NEEDS_TO_BE_R.E._IS_IT_CORRECT??$

Which of the following are incorrect options?

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