Which $2$ statements are true about billable expenses?

In QuickBooks Online

$1.$ Invoicing for a billable expense must always use an income account

$2.$ The Purchase transaction related to a billable expense can use an income account

$3.$ A default markup percentage can be added automatically on the invoice

$4.$ A default markup dollar amount can be added automatically on the invoice

$5.$ The purchase transaction related to a billable expense can use another asset account