In $2018,$ Amy and her spouse have net income for tax purposes of $$50,000$ and $$40,000,$ respectively. Amy$$s medical expenses consist of a medical bill of $$1,000$ she paid on September $15,2018,$ and another bill of $$3,000$ paid on September $30,2019.$ Amy$$s mother lives with them because she is physically infirm. Her medical expenses for $2019$ are $$6,000.$ Which of the following statements regarding Amy$$s medical expense tax credit for $2019$ is correct?

When calculating her medical expense tax credit, Amy should include $$4,000$ as medical expenses

A separate medical tax credit base calculation is required for Amy$$s mother

Amy$$s mother can not claim her own medical expenses because she is physically infirm.

Amy$$s spouse must claim the medical expenses since her spouse has the lower net income for tax purposes