The Following Series of Events/transactions Occurred on Bert Easley's Ranch

The following series of events/transactions occurred on Bert Easley's ranch:
March 3, 2016 - Bert buys the ranch for $900,000; gives a mortgage to First Interstate Bank (FIB) to secure the loan
April 12, 2018 - Bert gives First Federal (FF) a new mortgage (lower rate) ; FF pays off the FIB loan balance
August 17, 2020 - Bert installs wind power equipment and signs a security agreement with WP³ (the wind power seller) ; WP³ does not record a financing statement
If Bert defaults, what is the order of the creditor priorities?

A) FIB, FF, WP³
B) WP³, FF
C) WP³, FIB, FF
D) FF, WP³