A Customer Bought Two Items but Wants to Cancel One

Multiple Choice

A customer bought two items but wants to cancel one. Which option enables the administrator of the site to edit the quantity while the invoice is being captured in the admin area?

A) In the System Configuration, under the Sales section, set "Allow partial invoice" to "true".
B) In the payment method, set the $_canCapturePartial protected variable to true.
C) There are no native ways to do this; override the sales/order/invoice/view/items .phtml template.
D) In the configuration node, set default/payment/ {METHOD_NAME}/allow_partial_invoice to 1.