In 2010, the FTC added all of the following recommendations to its privacy guidelines except: A. firms should increase the transparency of their data collection. B. firms should require consumer consent and provide clear options to opt out of data collection. C. firms should limit the length of time that any personal data is stored to six months or less. D. consumers should be able to review and contest the accuracy and completeness of data. E. firms should build products and services that protect privacy.