Final answer:
Jaguar would be using a concentrated marketing strategy by targeting professionals earning over $250,000 for the Jaguar XKR.
Step-by-step explanation:
If Jaguar concentrated all its marketing efforts for the new Jaguar XKR on professionals earning more than $250,000, it would be using a concentrated marketing strategy. This strategy involves targeting a very specific segment of the market with tailored marketing campaigns. In contrast to an undifferentiated approach which targets the entire market or a multisegmented strategy which targets several segments, a concentrated strategy focuses on just one subgroup with distinct characteristics, such as high income in this case.