Which statement is correct with regard to the short-term memory?

Question

Question PPL(A) - Private Pilot License - Human factor and limitations

QuizVDS · Accepted Answer

It can store 7 (±2) items for 10 to 20 seconds

QuizVDS · Answer

It can store 10 (±5) items for 30 to 60 seconds

QuizVDS · Answer

It can store 3 (±1) items for 5 to 10 seconds

QuizVDS · Answer

It can store 5 (±2) items for 1 to 2 minutes

Id 40 - PPL(A) EN - Which statement is correct with regard to the short-term memory?