At US Data Corporation's Web Site,they Advertised That "Because of Our

Multiple Choice

At US Data Corporation's web site,they advertised that "Because of our commitment to quality and our vast amount of industry knowledge and experience,we have grown to be one of America's leading providers of mailing lists,marketing data,sales leads and research data.We maintain databases of information on consumers and businesses nationwide that set industry standards for mission critical currency,reliability and accuracy." Trying to reach 500 potential donors for their annual phone donation campaign,a local fire department purchased a list of donors from the company.This list is an example of a

A) stratified sample
B) systematic sample
C) judgment sample
D) frame