After dividing the market into segments, Holiday Inn has created hotel offerings under the InterContinental, Crowne Plaza, Holiday Inn, Holiday Inn Express, Hotel Indigo and Candlewood Suites brands, targeted at price insensitive vacationers, ‘road warrior’ executives, price conscious travelers, and mobile middle class vacationers, respectively. This is an example of:

A. Micromarketing
B. Concentrated marketing
C. Undifferentiated marketing
D. Differentiated marketing
E. Mass marketing