Which of the following statements about online magazine publishing is not true?

Question $26$ options:

The total magazine audience size increased from $2015$ to $2017,$ due entirely to the growth of digital magazines.

Only about $10\%$ of tablet computer owners read magazine content once a week.

The percentage of adults who read digital edition magazines has more than quadrupled since $2011.$

There an estimated $1,200$ magazine apps for mobile readers.