Reporting farmland sale on Form 6252

 2019 has a new requirement for Form 6252, to enter a code on line1 to describe the installment sale property.  One of the choices is Code 3 - and I have not idea what section2032A(e)(4)or (5) means?  This farmland was sold in 1996 and is reported on form 6252 first, then the gain is reported on form 4797 line 4 as Section 1231 gain, and then it flows through to Schedule D.  So on Form 6252 I fell like I should be using code 4 for line 1 (the description for 4 is:  All other installment sales not listed) and not Code 3? Is that correct?