Although the Big Data revolution brought about a raft of new techniques in the area of machine learning, the methods used for the collection and analysis of data continues ___________ till date.

A. improving
B. intermittently
C. transforming
D. unchanged
E. unmodified
F. advancing

OA: D. unchanged; E. unmodified. 

Explanation:

SAS

SubjectData collection and analysis 
InformationRaft of new techniques in machine learning
Structure Word
Negatoralthough 
Plug In Wordunchanged
AnswerUnchanged, unmodified

AOA

Pair Unchanged, unmodified
TripletImproving, advancing, transforming
Lone rangerintermittently
X

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