Melissa Thomas leads the marketing research division at Tronics Inc., a manufacturing company based in Alabama. To improve future sales of the company's products, she has decided to collect customer opinions and feedback on the current products offered by her company. For this purpose, Melissa is looking for a highly flexible contact method which can be used to gather large amounts of data within the least possible time. In this instance, which of the following contact methods is most likely to hold the highest appeal for Melissa?
A) online surveys
B) in-depth interviews
C) telephone interviews
D) individual interviews
E) mail questionnaires