(a) A corporation may acquire its own shares and shares so acquired constitute authorized but unissued shares, unless the articles of incorporation provide that reacquired shares become treasury shares or prohibit the reissue of reacquired shares.

(b) If the articles of incorporation prohibit the reissue of acquired shares, the number of authorized shares is reduced by the number of shares acquired, effective upon amendment of the articles of incorporation.

(c) The board of directors may adopt articles of amendment under this Code section without shareholder action. The articles must set forth:

(1) The reduction in the number of authorized shares, itemized by class and series; and

(2) The total number of authorized shares, itemized by class and series, remaining after reduction of the shares.

(d) The board of directors may adopt articles of amendment providing that reacquired shares become treasury shares without shareholder action.

(e) A corporation may create security interests in treasury shares.