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Table 2 List of question types generated by the application

From: Evaluating smartphone-based dynamic security questions for fallback authentication: a field study

Question type Question Retrieval type
Call Who called you on <time> ? Who did you call on <time> ? Recall
SMS Who SMS messaged you on <time> ? Who did you SMS message on <time> ? Recall
Location Where were you on <time> ? Recall
Application What are the applications you used in the last 24 h? Recognize
Music What are the music you listened to in the last 24 h? Recognize
Activity What activities did you perform in the last 24 h and when? Recognize and recall
Battery When did you charge your phone in the last 24 h and how was it charged? Recognize and recall