A map is being developed to process input data that contains invoices and purchase orders. The
first five records of the data are provided here:
The characters INV in the second field identify the record as an invoice.
The characters PO from the second field identify the record as a purchase order. The application
requires only processing purchase orders. Which function can be used in the functional map call to
process only the purchase orders?

A.
UNIQUE

B.
LOOKUP

C.
CHOOSE

D.
EXTRACT

Explanation: