In terms of effectiveness and efficiency of operations, as well as of meeting the generic Information System control goals of validity, completeness, and accuracy, what are the arguments for and against each of the following? Does it matter if the copy is paper or electronic?

a. Sending a copy of the purchase order from the purchasing department to the receiving department.

b. Having the "quantity ordered" field "blinded" on the receiving department copy of the purchase order.

c. Sending a copy of the vendor invoice to the purchasing department for approval of payment.

d. Sending a copy of the vendor invoice to the requisitioning department for approval of payment.