(a) The board shall increase each of the annual membership fees fixed by Sections 6140 and 6141 by an additional forty dollars ($40), to be allocated only for the purposes established pursuant to Section 6033, except to the extent that a member elects not to support those activities.
(b) The invoice provided to members for payment of the annual membership fee shall provide each member the option of deducting forty dollars ($40) from the annual membership fee if the member elects not to have this amount allocated for the purposes established pursuant to Section 6033.