Ports of Entry and Exit Are Defined As

Ports of entry and exit are defined as:

A) where the internal labor market comes in contact with the external labor market.
B) where manufactured products enter and leave a firm.
C) respectively,the wages workers take in and the output they produce.
D) respectively,the output workers produce and the wages they take in.
E) the methods by which inputs are received by a firm and output is delivered by a
Firm.