A telecommunication company is experiencing high churn rate. They have more than five million customers.
They have more than 400TB of call detail records per year. The majority of their customers are prepaid, so
they can change the telecom provider any time. In order to remedy the situation, they want to understand the
customer behavior. For that reason they want to build the individual profile of each customer. They also want to
enrich the profile by incorporating social media data. Given this set of requirements, which of the following
would you recommend?

A.
Hadoop

B.
RDBMS

C.
Storm

D.
IBM Cloudant

Explanation:
http://www.ibm.com/developerworks/library/os-twitterstorm/