Inherited IRA

In 2020 I closed out an Inherited IRA after receiving RMDs for 5 years. The 1099-R I received has the same amount in Box 1 - Gross Distribution and Box 2b - Taxable amount. I closed the account (knowing I would owe taxes) and divided it amongst our children who were out of work due to Covid.  Do I report this by checking "some or all of this withdrawal was an RMD" or "None won this withdrawal was an RMD"?