Before meeting in a closed or open session, a public body shall give reasonable advance notice of the session. Whenever reasonable, a notice under this section shall: be in writing; include the date, time, and place of the session; and if appropriate, include a statement that a part or all of a meeting may be conducted in closed session. A public body may give the notice under this section as follows: if the public body is a unit of State government, by publication in the Maryland Register; by delivery to representatives of the news media who regularly report on sessions of the public body or the activities of the government of which the public body is a part; if the public body previously has given public notice that this method will be used: by posting or depositing the notice at a convenient public location at or near the place of the session; or by posting the notice on an Internet website ordinarily used by the public body to provide information to the public; or by any other reasonable method. A public body shall keep a copy of a notice provided under this section for at least 3 years after the date of the session.