This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to avoid airport scam artists
Research each airport you are visiting.
There are hundreds of different types of scams, but certain ones are more prevalent at particular airports. Research each airport you will be passing through so that you know how to recognize which scams are common there.

Available choices:
(I). Make sure to look into airports where you have layovers as well as your departing airport and destination. Exchange currency before you reach the airport.;
(II). This may help you to know when to be wary of scams. Local airport scams might include layoffs, tourist scams, travel scams, rent and transportation scams.;
(III). Only plan to visit a particular airport if you intend to visit it again later. Wait for the light to turn red before going into that airport.;
(IV). Pay attention to the time of day. Parking lots in airports often may be excessively crowded during busy business hours, at night.;
The answer is:
(I).