A major telecommunication company has millions of customers. Most of their customers are prepaid. Being prepaid customer

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A major telecommunication company has millions of customers. Most of their customers are prepaid. Being prepaid customers, they can very easily switch to other vendors. The last four to six months, this company has lost quite a good number of customers to competition. They intend to build a system that can provide them with insight into the customers social network (e.g. who is the influencer and who is the follower). They also want the ability to monitor the voice and data usage patterns in real time and they want the system to be trained over time to predict possible dissatisfactions. Given this scenario, which one of the following would you recommend?

A. Hadoop
B. Spark
C. Cloudant
D. Netezza