(a) The powers granted in this section to the board of directors may be reserved to the shareholders by the articles of incorporation.
(b) The board of directors may authorize shares to be issued for consideration consisting of money, labor done or property actually received.
(c) Before the corporation issues shares, the board of directors must determine that the consideration received or to be received before issuance for shares to be issued is adequate. That determination by the board of directors is conclusive insofar as the adequacy of consideration for the issuance of shares relates to whether the shares are validly issued, fully paid, and nonassessable.
(d) When the corporation receives the consideration for which the board of directors authorized the issuance of shares, the shares issued therefor are fully paid, and nonassessable.