a. Waiver of disposition notification. A debtor or secondary obligor may waive the right to notification of disposition of collateral under § 8.9A-611 only by an agreement to that effect entered into and signed after default.

b. Waiver of mandatory disposition. A debtor may waive the right to require disposition of collateral under § 8.9A-620 (e) only by an agreement to that effect entered into and signed after default.

c. Waiver of redemption right. Except in a consumer-goods transaction, a debtor or secondary obligor may waive the right to redeem collateral under § 8.9A-623 only by an agreement to that effect entered into and signed after default.