On May 1, Lincoln lends Donaldson $200,000 and receives from Donaldson his agreement to pay this amount in two years and takes a security interest in the machinery and equipment in Donaldson’s...

On May 1, Lincoln lends Donaldson $200,000 and receives from Donaldson his agreement to pay this amount in two years and takes a security interest in the machinery and equipment in Donaldson’s factory. A proper financing statement is filed with respect to the security agreement. On August 1, upon Lincoln’s request, Donaldson executes an addendum to the security agreement covering after-acquired machinery and equipment in Donaldson’s factory. A second financing statement covering the addendum is filed. In September, Donaldson acquires $50,000 worth of new equipment from Thompson, which Donaldson installs in his factory. In December, Carter, a judgment creditor of Donaldson, causes an attachment to issue against the new equipment. What are the rights of Lincoln, Donaldson, Carter, and Thompson? What can the parties do to best protect themselves?