A security interest:

A) is an interest only in personal property to secure payment or performance of an obligation.
B) is effective against third parties, but not the debtor, when it "attaches."
C) may arise in fixtures under UCC Article 9.
D) in fixtures, even if perfected, will not have priority over a mortgage in the real property to which the goods are attached.

Security Interest

A legal claim or liens on property as collateral for the payment of a debt or performance of some other obligation.

Personal Property

Movable assets or belongings, excluding real estate and buildings, owned by an individual or entity.

Third Parties

Individuals or entities that are not directly involved in a contract or negotiation but may be affected by its outcomes or have an interest in its terms.