(a) a confession of judgment;
(b) a negotiable instrument;
(c) a security interest or any other claim of a property interest in any goods, except those goods the use of which is provided by the merchant pursuant to the agreement;
(d) a wage assignment;
(e) a waiver by the consumer of a claim, counterclaim or defense; or
(f) a requirement that the consumer purchase insurance or liability waiver against loss or damage to the rental property from the merchant. This subsection shall not, however, be construed to prohibit a merchant from offering insurance or a liability waiver to a consumer, if the merchant clearly discloses that acceptance of the offer of insurance or a liability waiver is optional.