(a) Waiver of disposition notification. —
A debtor or secondary obligor may waive the right to notification of disposition of collateral under Section 9-611 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 Section 9-620(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 Section 9-623 only by an agreement to that effect entered into and signed after default.