Of the six (I must be missing something important here. If you can think of a better E please add it to the comments.) I would go with eLearning. No email. No eLearning... eLearning - what is it? Now, ...
If we go by literal definition, eLearning is "electronic," and mLearning is "mobile." In that sense, the distinctions might appear glaringly evident - eLearning is done on the web, and mLearning is ...
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