(1)    Unless the articles of incorporation or bylaws provide otherwise, action required or permitted by this chapter to be taken at a board of directors’ meeting may be taken without a meeting if the action is taken by all members of the board. The action shall be evidenced by one or more written consents describing the action taken, signed by each director and retained by the corporation.

   (2)   Action taken under this section is effective when the last director signs the consent, unless the consent specifies a different effective date.

   (3)   A consent signed under this section has the effect of a unanimous vote taken at a meeting at which all directors were present, and may be described as such in any document.

   (4)   Any person, whether or not then a director, may provide, whether through instruction to an agent or otherwise, that a consent to action will be effective at a future time, including a time determined upon the happening of an event, and such consent shall be considered to have been given for purposes of this section at such effective time so long as the person is then a director and did not revoke the consent prior to that time. Any such consent shall be revocable prior to its becoming effective.