statement
The term statement as used in paragraphs (b) and (c) of this section means:
(1) A written statement made by said witness and signed or otherwise adopted or approved by him; or
(2) A stenographic, mechanical, electrical, or other recording, or a transcription thereof, which is a substantially verbatim recital of an oral statement made by said witness to an agent of the party obligated to produce the statement and recorded contemporaneously with the making of such oral statement.