Apple would like to gather data about the use of smartphones among teenagers. Which of the following techniques would be an example of quantitative data collection?
a. Surveying a random sample of 1000 teenagers about their smartphone usage habits
b. Analyzing smartphone usage data from 10,000 randomly selected teenagers' mobile devices
c. Conducting experiments to measure the average daily time spent on smartphones by teenagers
d. Observing and recording smartphone usage patterns of a specific group of teenagers over a period of one month
