Smartphones' Embedded GPS (Global Positioning System)

Smartphones' embedded GPS (Global Positioning System) :

A) delivers ads to consumers based on the conversations and behaviors they exhibit in social media.
B) indicates the phone's geographic location on a minute-by-minute basis and generates insights into consumer wants and needs.
C) shows whether a web surfer has been to a company's website before and made a purchase on the last visit.
D) acts as a tool to measure the effectiveness of an ad based on an estimate of how many people receive the ad on their phones.
E) delivers buying information to business consumers based on ethnographic positioning.