What condition is NOT required for attachment in a security interest?

For a security interest to attach, certain conditions must be met to ensure the secured party has a legal claim over the collateral. One of these core requirements is that a security agreement must usually be in place and can indeed be in writing, but it is not solely the act of having that written agreement that determines attachment.

The correct reasoning for the choice indicates that while a security agreement is essential, it does not exclusively need to be in writing. For an attachment to occur, the agreement simply needs to be enforceable under the law, and this can sometimes be satisfied through oral agreements or other forms of acknowledgment.

On the other hand, the conditions that do need to be present for attachment include that the secured party have possession of the collateral or that the debtor has an ownership interest in the collateral. Furthermore, a proper description of the collateral must be included in the security agreement to inform third parties of the secured party's interest. Thus, while a written agreement can help establish clarity and protect rights, it is not a strict prerequisite for attachment.