The article titled "Airlines Have Cracked the Fare Gamefor Now" includes the following statement: "U.S. airlines are testing a new secret weapon: passenger segmentation. So far it seems to hit the mark, but executives likely overrate its firepower during bad times".Also, the following: "...better customer targeting will 'offset weakness in demand.' The idea is that more fare classes and narrower price gaps between them mean there will always be a cabin type to suit each flier's budget".According to the statements, the airlines use a form of:

a.first degree price discrimination.

b.second degree price discrimination.

c.third degree price discrimination.

d.two-part tariffs.

e.block pricing.