The correct form is 'It is I.' Always use the nominative pronoun for the subject.
The correct option is A. It is I. In this case, 'I' is used in the nominative case as the subject pronoun. Nominative pronouns are used when the pronoun is the subject of a sentence or clause.
Example: It is I who will be attending the meeting.
Remember that 'me' is used in the accusative case for objects, while 'I' is used for subjects in a sentence.
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