Given the following SQL Query, which columns would you recommend to be indexed?

SELECT	InvoiceNumber, InvoiceDate, Invoice_Total, Invoice_Paid,
	Invoice_Total - Invoice_Paid as Balance
	FROM Invoice
	WHERE Invoice_Date >= "2015-07-20" and Salesman_Id = "JR"
	ORDER BY DESC Invoice_Total

Drag the correct answers to one of the three pockets.

Invoice Paid InvoiceNumber Invoice_Date Invoice_Total Salesman Id