Identify the following data as either time series or cross-sectional.
a. The 2007 CEO compensation of the 500 largest U.S. companies.
b. The annual compensation for the CEO of Coca-Cola Enterprises from 1990 to 2009.
c. The Weekly revenue for a Noodles & Company restaurant for the 52 weeks in 20009.
d. The number of skiers on the mountain on Christmas Day 2009 at each of the ski mountains owned by Vail Resorts.
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