As used in this subchapter, unless the context otherwise requires, “public servant” means:
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(1) Any officer or employee of this state or of any political subdivision thereof;
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(2) Any person exercising the functions of any such officer or employee;
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(3) Any person acting as an advisor, consultant, or otherwise in performing any governmental function, but not including witnesses; or
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(4) Any person elected, appointed, or otherwise designated to become a public servant, although not yet occupying that position.