Which combination of three IBM Watson services is applicable to assist an agent at a phone-based customer call center? (Choose three.)
A . Conversation
B . Tradeoff Analytics
C . Discovery
D . Natural Language Classifier
E . Speech to Text
F . Relationship Extraction
Answer: D,E,F
Explanation: https://github.com/havasnewyork/IBM-Watson-Developer-Certification-Study-Guide