(a) An officer may resign at any time by communicating his resignation to the corporation. A resignation is effective when it is communicated unless it specifies in writing a later effective date. If a resignation is made effective at a later date and the corporation accepts the future effective date, its board of directors may fill the pending vacancy before the effective date if the board of directors provides that the successor does not take office until the effective date.
(b) A board of directors may remove any officer at any time with or without cause.