1.After accounting for a sequence of pre numbered purchase orders, an auditor traces a sample of purchase orders to the accounts payable journal to obtain evidence that all purchase:

a.Included in the accounts payable journal have been recorded

b.Represented by purchase orders are included in the account payable journal.

c.Included in the accounts payable journal are represented by purchase orders.

d.Represented by purchase orders are valid.

Please explain why you choose one of them.