The following table gives the top five television shows, as determined by the Nielsen Ratings for the week ending October 19, 2008.

Rank	Show title	Network	Viewers (millions)
1	CSI	CBS	19.3
2	NCIS	CBS	18.0
3	Dancing with the Stars	ABC	17.8
4	Desperate Housewives	ABC	15.5
5	The Mentalist	CBS	14.9

A. What type of data is presented in the first column of the table?

B. What type of data is presented in the second column of the table?

C. What type of data is presented in the third column of the table?

D. What type of data is provided by the information in the fourth column of the table?